UCDP Dyadic Dataset
Codebook
Version 1-2009

Lotta Harbom
Uppsala Conflict Data Program (UCDP)
Department of Peace and Conflict Research, Uppsala University

When using the data, please cite Harbom, Lotta, Erik Melander & Peter Wallensteen, 2008.
“Dyadic Dimensions of Armed Conflict, 1946-2007.” Journal of Peace Research 45(5): 697710 and (when appropriate) this codebook. Please always include the version number in analyses
using the dataset. When referring to the dataset, make sure to use the correct name: the UCDP
Dyadic Dataset.

1

Introduction

This document describes the UCDP Dyadic Dataset, a project within the Uppsala Conflict Data
Program (UCDP), at the Department of Peace and Conflict Research, Uppsala University. The
dataset was first presented in Harbom, Melander and Wallensteen (2008) and is available fordownload from http://www.pcr.uu.se/research/UCDP/data_and_publications/datasets.htm.
The UCDP Dyadic dataset builds on the UCDP/PRIO Armed Conflict dataset, but goes beyond
the conflict level and focuses on dyads within each conflict. As such, it constitutes adisaggregated version of the UCDP/PRIO Armed Conflict dataset. It is compatible with a rangeof other datasets, both provided by UCDP and by PRIO (International Peace Research Institute,Oslo).
Version 1-2009 is updated in accordance to the changes listed in Harbom & Wallensteen (2009),
and the 2008 conflicts have been added to the database. We refer the reader to our Version
History document for details of other changes and revisions to the dataset. The dataset willcontinue to be updated annually and made available simultaneously with the updated version of
the UCDP/PRIO Armed Conflict Dataset.

2

Definition of conflict and dyad

The definition of an armed conflict is fundamental to UCDP’s data collection exercise and the
dyad is a key component of that definition. The main unit in this dataset is a “Conflict Dyad” asdefined by UCDP.1 This definition is presented unabridged in section 2.2. Each conflict dyad islisted in the database and given a unique ID code.

2.1

Armed Conflict

UCDP defines armed conflict as: “a contested incompatibility that concerns government and/or
territory where the use of armed force between two parties, of which at least one is thegovernment of a state, results in at least 25 battle-related deaths in a year”.
For an in-depth discussion of all elements of this definition, see the codebook for the
UCDP/PRIO Armed Conflict Dataset.

2.2

Conflict Dyad

A conflict dyad is two conflicting primary parties of which at least one is the government of astate. In interstate conflicts, both primary parties are state governments. In conflict dyads inintrastate and extrasystemic conflicts the non-governmental primary party is an organised
opposition organisation.
The separate elements of the definition are operationalized as follows:1

For a more in-depth discussion on definitions, see
http://www.pcr.uu.se/research/UCDP/data_and_publications/definitions_all.htm

1) Primary parties: The parties that form the incompatibility by stating incompatible positions.
The incompatibility (i.e. the conflict issue) must concern governmental power (type ofpolitical system, the replacement of the central government or the change of its
composition), territory (the status of a territory, e.g. the change of the state in control of acertain territory - interstate conflict - secession or autonomy - internal conflict) or both.
2) Government: The party controlling the capital of a state.
3) State: A state is an internationally recognised sovereign government controlling a specificterritory or an internationally unrecognised government controlling a specified territory
whose sovereignty is not disputed by another internationally recognized sovereign
government previously controlling the same territory. See section 4 for details on thesample of countries covered by this definition.
4) Opposition organization: Any non-governmental group of people having announced a namefor their group and using armed force to influence the outcome of the statedincompatibility. The UCDP only deals with formally organized opposition. The focus ison armed conflict involving consciously conducted and planned political campaigns rather
than spontaneous violence.
To differentiate between dyads is at times problematic. When is a dyad completely new and whenis it simply a continuation of an already registered dyad, only slightly altered? The key difficulty
here is to distinguish between opposition organisations, as the other primary party in the dyad –the government of a state – never changes. 2 Some opposition groups tend to be fractious,
splitting into different sub-groups while others join larger coalitions or umbrella groups. UCDP
follows four main rules:● However many times a group changes its name, it still retains the same DyadID (forexceptions, see below).
● When a group splits, the splinter group is considered a completely new opposition
organisation, and if it continues opposing the government and all other criteria are
fulfilled, it constitutes part of a new dyad in the dataset, with a new DyadID.
Comment: It is sometimes difficult to determine which of the groups should be viewed as
the splinter and which should be seen as the original group, as both fractions tend toclaim to be the “real” rebel group. UCDP deals with this by tracing the main part (i.e. themost numerous) of the group, which is then coded as the original one. Should this beproblematic to determine, a second option is to trace the original leader of the group inorder to identify the original opposition organisation.
● When two or more already registered groups join together under a new name in a tightcoalition with joint military operations, the new coalition is regarded as a new opposition
organisation. If it continues to oppose the government and if all other criteria are fulfilled,
it is included as part of a new dyad in the dataset, and given a new DyadID.
● When an already registered group is joined by another group that has previously not beencoded as active in the dataset, the opposition organisation is viewed as a continuation of
the former. This applies even when the name of the group is changed.
Comment: It should be noted that while this rule is applied in most cases in the dataset
conventional logic made it necessary to make some exceptions. Whereas the rule works
well in e.g. the case of NRA in Uganda, which was originally called PRA, but changed its
name when it was joined by the much smaller and militarily insignificant UFF, the logic isless clear in the case of e.g. the Independent Nasserist Organisation in Lebanon (a.k.a. alMourabitoun), which was active in fighting the government of Lebanon in 1958 and also
2

By this we mean that while the party in control of the government may change it is still viewed as one and thesame party in the dataset.

resurfaced as part of the Lebanese National Movement in 1975. In this case it is intuitively
and factually incorrect to characterise the LNM as being a simple continuation of alMourabitoun, and the dyad is thus characterised as being an entirely new one

2.3

Missing data problems

The missing data code is -99. However, the dataset does not include unclear conflicts where
information on key variables to the definition of conflict and dyad is uncertain or missing. Keyvariables are those related to the incompatibility, actors and intensity. In addition, a number of
events have been identified as potentially in accordance with the criteria for inclusion. These
events include possible new dyads and additional years for active conflicts. Consult the list of
unclear cases for further information.
The information also varies with regard to the level of precision. For the start date variables, theprecision level is indicated in a separate variable, see 3.14 and 3.16. Apart from that, the dataset
only includes information when we are quite confident that it is correct. The bias produced bythis approach is against the inclusion of conflicts in the earlier decades and in the less-developed
world. An armed conflict in a developed country in the 1990s is more likely to be recorded than aconflict in a less developed country in the 1950s.

2.4 Version name convention
This codebook corresponds to version 1-2009 of the UCDP Dyadic Dataset. For every new
release, substantial changes will be documented in a separate document. This should be helpful toresearchers trying to replicate a particular study. We recommend that whenever this dataset isused, the version number should be cited.

3

The main conflict table

The observation (or unit) in the Main Conflict table is the dyad-year. Each dyad is listed in all
years where fighting caused at least 25 battle-related deaths.
The calendar year is the basic unit of every observation. Thus, if fighting in a dyad during theperiod June–September results in 30 casualties, the dyad will be considered active and will thus be
included in the dataset However, if the same number of casualties occurred in the period
November–February and fighting in the dyad failed to reach the threshold of 25 battle-related
deaths in either calendar year, the dyad will not be coded as active in either year. This has anumber of consequences that will be discussed below. Start dates frequently refer to years prior
to the first calendar year of dyad activity, as the start of a conflict might be in a year with less than
25 casualties. Certain observations might be based on a single event, such as the Omagh bombing
in Northern Ireland in 1998, which exceeded the minimum threshold for armed conflict.
Table 1. Definition of variables in the main conflict table

Variable
DyadIDID

Label
Dyad identifier
Conflict identifier

Description
The unique identifier of all dyads
Identifies
which
conflictintheUCDP/PRIO Armed Conflict Dataset any
given dyad is a part of.

Location

Country name(s)SideACountry name(s)SideA2nd

Name of state(s)supporting side A withtroops.
Country name(s) or
Opposition actor

SideB

SideB2nd
IncompTerr

Name of state(s)supporting side B withtroopsDyad incompatibility
Name of territory

Year
Int

Year of observation
Intensity level

Type

Startdate
Startprec
Startdate2

Startprec2
GWNoA
GWNoA2nd
GWNoB
GWNoB2nd
GWNoLoc

The name(s) of the country/countries
whose government(s) have a primary claim
to the issue in dispute.
Identifying the country/countries of side A
in a conflict. Always the government side ininternal conflicts. Note that this is a primary
party to the conflict.
Identifying the country/countries
supporting side A in the conflict.
Identifying the opposition actor orcountry/ countries of side B in the conflict.
In an internal conflict, this includes a
military opposition organization. Note that
this is a primary party to the conflict.
Identifying the country/countries
supporting side B in the conflict.
A general coding of the conflict issue
The name of the territory over which theconflict is fought, provided that theincompatibility is territory.

The intensity level in the dyad per calendar
year. Two different intensity levels arecoded: minor armed conflicts and wars. See
Section 3.11 for definitions of the twocategories.
Conflict type
The type of conflict that the dyad is active
in. Four different types of conflict:extrasystemic, interstate, internal andinternationalized internal. See Section 3.12
for definitions of the four types.
Date of conflict
The date, as precise as possible, of the firstinitiation
battle-related death in the dyad.
Precision of startdate
The level of precision for the initialstartdate.
Date of fatality
The date, as precise as possible, of whenthresholdfighting in the dyad for the first timereached 25 battle-related deaths in acalendar year.
Precision of startdate2
The level of precision for startdate2.
GW number(s) of side
GW numbers of all countries on side A,A
separated by semicolons.
GW number(s) of states GW numbers of all countries supporting
supporting side A
side A with troops.
GW number(s) of side B GW numbers of all countries on side B,
separated by semicolons.
GW number(s) of states GW numbers of all countries supporting
supporting side B
side B with troops.
GW number(s) of
GW numbers of all location countries,

RegionlocationsRegion of location

VersionVersion number

3.1

separated by semicolons.
Identifying the region of the location.
See Section 3.22 for the definition of theregions.
The current version of the dataset. See
Section 2.3.

DyadID

Dyad identifier.

3.2

ID

Conflict identifier.

3.3

Location

Location is defined as the government side in a dyad, and should not be interpreted as thegeographical location of the conflict.
--

For dyads in internal and internationalized internal conflicts (see 3.12 for definition), only
one country name is listed. This is the country whose government is disputed.
In most interstate conflicts only one dyad, i.e. two states, is active and both these primaryparties are listed in the Location filed. Even when several governments are involved in a
conflict, these are all included as the same dyad in this version of the dataset. 3
Subsequently, in these few cases all parties are listed in the location filed.
For dyads in extrasystemic conflicts, Location is set to be the disputed area, not the
government of the colonial power. Thus, in these conflicts the Location filed bydefault does not indicate members of the international system.

Location is a string variable, listing the names of the countries involved. These might be fighting
together or against each other. The string is split in two ways, hyphen (‘-‘) splits the different
sides in an interstate war, and comma (‘,’) splits different countries fighting together on the same
side.

3.4

SideA

Side A is by definition always a primary party to the conflict. In internal conflicts, side A is always
the government side, it is one of the sides in interstate conflicts and the colonial state in
extrasystemic conflicts.
Side A is a string variable, and in the few cases where there are more than one primary party onside A (see section 3.3), these are separated by a comma (‘,’).
3

There are three cases in the dataset where there are more than two primary parties active in a conflict between
states. These are the Arab-Israeli war of 1948-49, the Suez war of 1956 and the war in Iraq in 2003.

3.5

SideA2ndSide A Secondary lists all states that enter a conflict with troops to actively support side A in the
dyad. By definition, only independent states can be a secondary party in conflict. A secondary
party on side A shares the position in the incompatibility with Side A in the conflict. Side A
Secondary does not need to meet the 25 battle-related deaths criterion to be included in thedataset; an active troop participation is enough.
Side A Secondary is a string variable, where the different names are separated by a comma (‘,’).

3.6

SideB

Like Side A, Side B is by definition a primary party to the conflict. Side B is the opposition sideof all internal and extrasystemic conflicts and the second side in an interstate conflict. Thus, side
B can include both states and non-governmental opposition groups, depending on the type of
conflict. When the primary party listed on Side B is an opposition group, the column lists thegroup name in abbreviated form. Even if the group changes its name during the course of theconflict we record them under the same name for all years. Thus, instead of recording PRA(Popular Resistance Army) for Uganda 1982, we have recorded NRA (National Resistance Army)for all years (1982-86), even though the group only changed its name from PRA to NRA in 1983.
We refer to the conflict list and UCDP’s opposition group dataset (to be released in July 2009)
for the full name and name history of opposition groups. The opposition group dataset will beavailablefordownloadfrom
http://www.pcr.uu.se/research/UCDP/data_and_publications/datasets.htm
Side B is a string variable, where the different names (in the few relevant cases, see 3.3) are
separated by a comma (‘,’).

3.7

SideB2ndSide B Secondary lists all states that enter a conflict with troops to actively support side B in the
dyad. Only states are included as Side B Secondary. Furthermore, the states listed share theposition in the incompatibility with Side B in the conflict. Side B Secondary does not need tomeet the 25 battle-related deaths criterion to be included in the dataset; active troop participationis enough.
Side B Secondary is a string variable, where the different names are separated by a comma (‘,’).

3.8

Incomp

As a country can experience several simultaneous conflicts, it is essential to differentiate between
them. As described in Section 2.1, UCDP collects information on conflicts where theincompatibility, i.e. the general incompatible positions, concerns either government, territory or
both. The incompatibility is coded in three categories:
1 Territory
2 Government

3 Government and Territory
Note that the incompatibility expressed in terms of government or a specific territory is crude in
the sense that possible underlying incompatibilities are not considered. In other words, the statedincompatibility is what the parties are (or claim to be) fighting over, but it says nothing about why
the parties are fighting.
While a state can only experience one intrastate conflict over government in a given year, thatsame state can simultaneously be a primary party to one or more interstate conflicts over
government and/or territory. In the case of intrastate territorial conflicts, multiple conflicts canbe recorded over different territories in a state in a given year. Furthermore, as each conflict caninvolve more than one dyad, the state can simultaneously be involved in several dyads inextrasystemic- as well as intrastate conflicts.

3.9

Terr

If the incompatibility is territory, the disputed territory will be listed here. In case the two sides
use different names for the disputed territory, the name listed is the one used by the opposition
organisation. One reason for this is that this is most often the name that the general publicrecognises. Another reason is that there are cases where the disputed territories do not have anofficial name. This is the case in e.g. DyadID 313, active in conflict ID 227, a territorial conflictin north-eastern India. The rebel organisation NDFB is fighting for independence for a territorythat is a part of the Assam region, and does not have an official, separate name. Thus, we use therebel's name for the territory: Bodoland.

3.10 YearThe year of observation.

3.11 Int
The intensity variable is coded in two categories:
1 (Minor): Between 25 and 999 battle-related deaths in a given year.
2 (War): 1000 or more battle-related deaths in a given year.

3.12 TypeA dyad can be active in four different types of conflict:1

23

Extrasystemic armed conflict occurs between a state and a non-state group outside its
own territory. (In the COW project, extrasystemic war is subdivided into colonial war andimperial war, but this distinction is not used here.) These conflicts are by definition
territorial, since the government side is fighting to retain control of a territory outside thestate system.
Interstate armed conflict occurs between two or more states.
Internal armed conflict occurs between the government of a state and one or moreinternal opposition group(s) without intervention from other states.

4Internationalized internal armed conflict occurs between the government of a state andone or more internal opposition group(s) with intervention from other states (secondary
parties) on one or both sides.

3.13 Startdate

The date of the first battle-related death recorded in the dyad is coded as the Startdate in thedataset. The date is set after the dyad fulfils all criteria required in the definition of an armed dyad,
except for the number of deaths. In some cases, the initial fatality occurs in a year prior to thefirst year of activity. For instance, in the dyad ‘Government of Uzbekistan-IMU’ (DyadID 363) inthe Uzbek conflict (conflict ID 221), the first battle-related deaths occurred in February 1999.
During the remaining months of 1999, the conflict did not reach the required 25 battle-related
deaths threshold and the conflict is thus coded as inactive in 1999. 25 battle-related deaths were
not recorded until the following year.

3.14 Startprec
The Startdate is coded as precisely as possible. For certain dyads we can pinpoint the start of thearmed conflict down to a single event, taking place on a specific day. For other dyads, this is notpossible, due to lack of precise information.
The Startprec (start precision) is coded to highlight the level of certainty for the date set in theStartdate variable.
1. Day, month and year are precisely coded; we have good information on the event.
2. Day is assigned; month and year are precisely coded. The assigned date can either be one ofseveral events that can be classified as the first; it can be the last day in a period when several
fatalities have been reported jointly or it can be an event that different sources claim occurred on
different dates.
3. Day is unknown; month and year are precisely coded. The day is known to be in a given
month, but we are missing information on an exact date. Day is then set to the first day of themonth.
4. Month is assigned; year is coded precisely. Day is set as the first day of the assigned month.
5. Day and month are unknown, year is coded precisely. Day and month are set as the 1 Januaryof the coded year.
6. Year is assigned. There is a wide disagreement between different sources, so that not even year
can be coded precisely. The start year is assigned based on subjective judgment.
7. Year is missing. No information on the start date is available; Startdate is set to 1 January of
the first year recorded in for the dyad.

3.15 Startdate2

The first time the dyad reaches 25 battle-related deaths in one calendar year. Startdate2 thus
indicates the date that the dyad fulfils all criteria required in the definition of an armed dyad forthe first time. In case precise information is lacking, Startdate2 is by default set to 1 January (oridentical to StartDate if the first fatality occurred later in the year).

3.16 Startprec2

In cases where Startdate and Startdate2 indicate the same year, the precision codes for Startdate2,
Startprec2, follows the same logic as for Startprec. However, if Startdate and Startdate2 represent
different years, values 11–17 are assigned. This ensures that information on both the precision
for the date given for Startdate 2 and its relation with Startdate are provided. For instance, aStartprec2 of 11 indicates that the precision score is 1 and that the start date 1 was in a previous
year. A Startprec2 of 12 means that the precision score is 2 and that the start date 1 was in aprevious year, etc. See 3.14. for explanations on the precision scores. Note: If the dyad was active(i.e. fulfilled all inclusion criteria) before 1946, Startdate2 is set to 1 January of 1946 andStartprec2 is given the precision score 17.

3.17 GWNoA
To facilitate analytical use of the dataset, country codes for the active state(s) on side A are listed
in this field. The country codes are taken from Gleditsch & Ward (1999). In line with 3.4, ininternal conflicts GWNoA lists the country code of the government; in interstate conflicts it
arbitrarily lists one of the states and in extrasystemic conflicts it lists the code for the colonialstate.
GWNo A is a string variable, where the numbers are separated by a comma (‘,’).

3.18 GWNoA2nd
GWNo A Secondary lists the country codes for the states coded in Side A Secondary (3.5).
GWNo A Secondary is a string variable, where the numbers are separated by a comma (‘,’).

3.19 GWNoB

GWNoB lists the country codes for states coded in Side B. GWNoB is only coded in interstate
dyads, since that is the only time a state is active on side B. (see 3.4-3.7)
GWNoB is a string variable, where the numbers are separated by a comma (‘,’).

3.20 GWNoB2nd
GWNoB2nd lists the country codes for the states coded in Side B Secondary (3.7).
GWNo2nd is a string variable, where the numbers are separated by a comma (‘,’).

3.21 GWNoLoc
This field contains the country code(s) for the state(s) listed in the Location variable. Thus, it lists
the country codes for the primary party/parties in the conflict.

GWNoloc is a string variable, where the numbers are separated by a comma (‘,’).

3.22 Region
Region of location
Region
1
2
3
4
5

Name
EuropeMiddle East
Asia
AfricaAmericasStartGWNo
200
630
700
400
2

EndGWNo
395
698
990
625
165

3.23 Version
See 2.3.

4

System Membership description

The definition of a state is crucial to the UCDP/PRIO conflict list, and subsequently also for the
dyadic dataset. State: A state is(a) an internationally recognized sovereign government controlling a specified territory, or(b) an internationally unrecognized government controlling a specified territory whosesovereignty is not disputed by another internationally recognized sovereign government
previously controlling the same territory.
The conflict definition, and hence also the dyad definition, is based upon participating
governmental actors of independent states, and the classification of a given conflict rests heavily
upon the status of the different actors. In order to define the total population of states we use the
Gleditsch & Ward (1999) systems membership definition, which is based on the Correlates of
War project. Gleditsch & Ward include countries with a population of more than 250,000 thathave ‘a relatively autonomous administration over some territory’, and is ‘considered a distinct
entity by local actors or the state it is dependent on’ (Gleditsch & Ward, 1999: 398).
The Gleditsch & Ward definition differs from our original definition in two main ways. First, for
Gleditsch & Ward a state is considered to be a new entity if it is ‘considered a distinct entity by
local actors’ while the conflict definition only recognizes it as a new entity when the ‘sovereignty
is not disputed by another internationally recognized sovereign government previously
controlling the same territory’. Second, the Gleditsch & Ward states all have a population of
more than 250,000 while our conflict definition does not prescribe a specific size of the
population. In a few cases, countries with less than 250,000 inhabitants experience conflict or are
active as secondary parties in a conflict. In those cases we use the Gleditsch & Ward tentative listof microstates. For example, the microstate Tonga was part of the multinational coalition fighting
in Iraq in 2004.
The UCDP/PRIO dataset includes one political entity that lacks a country code (GWNoA is set
at -99) as it is excluded from both the Gleditsch & Ward system membership table and thetentative list of microstates: Hyderabad (Hyderabad vs. CPI and Hyderabad vs. India). In 1947
when England granted India independence, a cabinet memorandum declared that the Princely
States were free to decide to either join India or Pakistan before August 1947 - or devise theirown sovereign political system for self-governance. Hyderabad declared itself independent on 15
August 1947. The state was populated by approximately 15,000,000 inhabitants. The systemmembership ended when Hyderabad was annexed by India in September 1948, after Winston
Churchill had proposed to the United Nations to consider it as an independent state.
In a few cases, the dataset have a different sovereignty date for some countries that haveexperienced conflict:
Croatia

Gleditsch & Ward
UCDP/PRIO
Bosnia-Herzegovina Gleditsch & Ward
UCDP/PRIO
Azerbaijan
Gleditsch & Ward
UCDP/PRIO

25 June 1991 declares independence
27 April 1992 the new constitution of Yugoslavia
3 Mars 1992 declares independence
27 April 1992 the new constitution of Yugoslavia
30 August 1991 becomes independent
21 December 1991

Gleditsch & Ward use a slightly modified version of the COW numbering system. The tablebelow presents the system membership table that we base our data tables on. These data are
updated through 31 December 2005 by us, based on the assumption that no country has enteredor left the international system after the most recent version of the Gleditsch & Ward data.
Table 2. List of system members since 1946
StateNum
2
20
31
53
40
41
42
51
52
70
80
90
91
92
93
94
95
100
101
110
115
130
135
140
145

StateAbb
USA
CAN
BHM
BAR
CUB
HAI
DOM
JAM
TRI
MEX
BLZ
GUA
HON
SAL
NIC
COS
PAN
COL
VEN
GUY
SUR
ECU
PER
BRA
BOL

StateName
United States of America
CanadaBahamasBarbados
Cuba
Haiti
Dominican Republic
Jamaica
Trinidad and Tobago
MexicoBelizeGuatemalaHonduras
El Salvador
Nicaragua
Costa Rica
PanamaColombia
Venezuela
GuyanaSurinamEcuador
Peru
BrazilBolivia

StartYear
1946
1946
1973
1966
1946
1946
1946
1962
1962
1946
1981
1946
1946
1946
1946
1946
1946
1946
1946
1966
1975
1946
1946
1946
1946

EndYear
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005

150
155
160
165
200
205
210
211
212
220
225
230
235
260
265
290
305
310
315
316
317
325
338
339
343
344
345
346
349
350
352
355
359
360
365
366
367
368
369
370
371
372
373
375
380
385
390
395
402
404
411

PAR
CHL
ARG
URU
UK
IRE
NTH
BEL
LUX
FRN
SWZ
SPN
POR
GFR
GDR
POL
AUS
HUN
CZE
CZR
SLO
ITA
MLT
ALB
MAC
CRO
YUG
BOS
SLV
GRC
CYP
BUL
MLD
RUM
RUS
EST
LAT
LIT
UKR
BLR
ARM
GRG
AZE
FIN
SWD
NOR
DEN
ICE
CAP
GNB
EQG

Paraguay
Chile
Argentina
Uruguay
United Kingdom
IrelandNetherlands
Belgium
Luxembourg
FranceSwitzerland
Spain
Portugal
German Federal Republic
German Democratic Republic
PolandAustria
Hungary
Czechoslovakia
Czech Republic
Slovakia
Italy/Sardinia
Malta
Albania
Macedonia
Croatia
Yugoslavia (Serbia)
Bosnia-Herzegovina
Slovenia
GreeceCyprusBulgaria
Moldova
Rumania
Russia (Soviet Union)
Estonia
LatviaLithuania
UkraineBelarus
Armenia
Georgia
Azerbaijan
FinlandSwedenNorwayDenmark
IcelandCape Verde
Guinea-Bissau
Equatorial Guinea

1946
1946
1946
1946
1946
1946
1946
1946
1946
1946
1946
1946
1946
1949
1949
1946
1946
1946
1946
1993
1993
1946
1964
1946
1991
1991
1946
1992
1991
1946
1960
1946
1991
1946
1946
1991
1991
1991
1991
1991
1991
1991
1991
1946
1946
1946
1946
1946
1975
1974
1968

2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
1990
2005
2005
2005
1992
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005

420
436
432
433
434
435
437
438
439
450
451
452
461
471
475
481
482
483
484
490
500
501
510
511
516
517
520
522
530
531
540
541
551
552
553
560
565
570
571
572
580
581
590
600
615
616
620
625
630
640

GAM
NIR
MLI
SEN
BEN
MAA
CDI
GUI
BFO
LBR
SIE
GHA
TOG
CAO
NIG
GAB
CEN
CHA
CON
DRC
UGA
KEN
TAZ
ZAN
BUI
RWA
SOM
DJI
ETH
ERI
ANG
MZM
ZAM
ZIM
MAW
SAF
NAM
LES
BOT
SWA
MAG
COM
MAS
MOR
ALG
TUN
LIB
SUD
IRN
TUR

GambiaNiger
Mali
SenegalBenin
Mauritania
Cote D’Ivoire
GuineaBurkina Faso
Liberia
Sierra Leone
Ghana
Togo
Cameroon
Nigeria
Gabon
Central African Republic
Chad
Congo
Congo, Democratic Republic of(Zaire)UgandaKenya
Tanzania/Tanganyika
ZanzibarBurundiRwandaSomalia
Djibouti
Ethiopia
EritreaAngolaMozambiqueZambiaZimbabwe (Rhodesia)
MalawiSouth Africa
Namibia
LesothoBotswana
Swaziland
Madagascar
Comoros
Mauritius
MoroccoAlgeria
Tunisia
Libya
Sudan
Iran
Turkey/Ottoman Empire

1965
1960
1960
1960
1960
1960
1960
1958
1960
1946
1961
1957
1960
1960
1960
1960
1960
1960
1960

2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005

1960
1962
1963
1961
1963
1962
1962
1960
1977
1946
1993
1975
1975
1964
1965
1964
1946
1990
1966
1966
1968
1960
1975
1968
1956
1962
1956
1951
1956
1946
1946

2005
2005
2005
2005
1964
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005

645
651
652
660
663
666
670
678
680
690
692
694
696
698
700
701
702
703
704
705
710
711
712
713
731
732
740
750
760
770
771
775
780
781
790
800
811
812
816
817
820
830
835
840
850
860
900
910
920
940
950

IRQ
EGY
SYR
LEB
JOR
ISR
SAU
YEM
YPR
KUW
BAH
QAT
UAE
OMA
AFG
TKM
TAJ
KYR
UZB
KZK
CHN
TBT
MON
TAW
PRK
ROK
JPN
IND
BHU
PAK
BNG
MYA
SRI
MAD
NEP
THI
CAM
LAO
DRV
RVN
MAL
SIN
BRU
PHI
INS
ETM
AUL
PNG
NEW
SOL
FJI

Iraq
Egypt
Syria
LebanonJordanIsraelSaudi Arabia
Yemen (Arab Republic of Yemen)
Yemen, People's Republic of
KuwaitBahrain
Qatar
United Arab Emirates
Oman
Afghanistan
Turkmenistan
Tajikistan
Kyrgyz Republic
Uzbekistan
Kazakhstan
China
Tibet
Mongolia
TaiwanKorea, People's Republic ofKorea, Republic of
Japan
India
BhutanPakistan
Bangladesh
Myanmar
Sri Lanka (Ceylon)
Maldives
Nepal
ThailandCambodia
Laos
Vietnam, Democratic Republic ofVietnam, Republic of
Malaysia
Singapore
Brunei
Philippines
Indonesia
East Timor
Australia
Papua New Guinea
New Zealand
Solomon Islands
Fiji

1946
1946
1946
1946
1946
1948
1946
1946
1967
1961
1971
1971
1971
1946
1946
1991
1991
1991
1991
1991
1946
1946
1946
1949
1948
1948
1946
1947
1949
1947
1972
1948
1948
1965
1946
1946
1954
1954
1954
1954
1957
1965
1984
1946
1946
2002
1946
1975
1946
1978
1970

2005
2005
2005
2005
2005
2005
2005
2005
1990
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
1950
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
1975
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005

5

References

Gleditsch, Kristian S. & Michael D. Ward, 1999. “Interstate System Membership: A Revised Listof the Independent States since 1816.” International Interactions 25: 393-413.
Gleditsch, Nils Petter; Peter Wallensteen, Mikael Eriksson, Margareta Sollenberg & Håvard
Strand, 2002. “Armed Conflict 1946-2001: A New Dataset.” Journal of Peace Research 39(5):615-637.
Harbom, Lotta & Peter Wallensteen, 2009. “Armed Conflicts 1946-2008”, Journal of Peace Research
46(4).
Harbom, Lotta, Erik Melander & Peter Wallensteen, 2008. ”The Dyadic Dimension of Armed
Conflict, 1946–2007” Journal of Peace Research 45(5): 697-710
Held, Birger, 1993. “Armed Conflicts over Government and Territory 1989-91” in Heldt, Birgered., States in Armed Conflict 1990-91. Uppsala: Uppsala University.
Kreutz, Joakim, 2006. “How Armed Conflicts End” Unpublished Manuscript.