Question: When was Eritrea annexed by the largest peacekeeping troop contributor to the group in which the US and biggest medal winner in the 1960 Olympics became important members?

full_context: Document 1: United Nations Population Fund: Contributions from governments and the private sector to UNFPA in 2014 exceeded $1 billion. The amount includes $477 million to the organization’s core resources and $529 million earmarked for specific programs and initiatives.
Document 2: Eritrea: The creation of modern-day Eritrea is a result of the incorporation of independent, distinct kingdoms and sultanates (for example, Medri Bahri and the Sultanate of Aussa) eventually resulting in the formation of Italian Eritrea. In 1947 Eritrea became part of a federation with Ethiopia, the Federation of Ethiopia and Eritrea. Subsequent annexation into Ethiopia led to the Eritrean War of Independence, ending with Eritrean independence following a referendum in April 1993. Hostilities between Eritrea and Ethiopia persisted, leading to the Eritrean–Ethiopian War of 1998–2000 and further skirmishes with both Djibouti and Ethiopia.
Document 3: Modern history: It is possible that around 62 million people died in the war; estimates vary greatly. About 60% of all casualties were civilians, who died as a result of disease, starvation, genocide (in particular, the Holocaust), and aerial bombing. The former Soviet Union and China suffered the most casualties. Estimates place deaths in the Soviet Union at around 23 million, while China suffered about 10 million. No country lost a greater portion of its population than Poland: approximately 5.6 million, or 16%, of its pre-war population of 34.8 million died.
Document 4: Soviet Union: The Soviet Union suffered greatly in the war, losing around 27 million people. Approximately 2.8 million Soviet POWs died of starvation, mistreatment, or executions in just eight months of 1941 -- 42. During the war, the Soviet Union together with the United States, the United Kingdom and China were considered as the Big Four of Allied powers in World War II and later became the Four Policemen which was the foundation of the United Nations Security Council. It emerged as a superpower in the post-war period. Once denied diplomatic recognition by the Western world, the Soviet Union had official relations with practically every nation by the late 1940s. A member of the United Nations at its foundation in 1945, the Soviet Union became one of the five permanent members of the United Nations Security Council, which gave it the right to veto any of its resolutions.
Document 5: 2014 Winter Olympics medal table: Initially, host nation Russia matched the Soviet Union's 1976 achievement of thirteen gold medals, but 4 gold medals (13 overall) were stripped later due to doping. Norway achieved the leading position in the medal table on 24 November 2017, when Russia was stripped of two gold medals in bobsleigh. However, at the end of January 2018, the Court of Arbitration for Sport cleared 28 Russian athletes and 9 out of 13 medals (including 3 gold) were reinstated, allowing Russia to return to the top position.
Document 6: Great power: When World War II started in 1939, it divided the world into two alliances—the Allies (the United Kingdom and France at first in Europe, China in Asia since 1937, followed in 1941 by the Soviet Union, the United States); and the Axis powers consisting of Germany, Italy and Japan.[nb 1] During World War II, the United States, United Kingdom, and Soviet Union controlled Allied policy and emerged as the "Big Three". The Republic of China and the Big Three were referred as a "trusteeship of the powerful"  and were recognized as the Allied "Big Four" in Declaration by United Nations in 1942. These four countries were referred as the "Four Policemen" of the Allies and considered as the primary victors of World War II. The importance of France was acknowledged by their inclusion, along with the other four, in the group of countries allotted permanent seats in the United Nations Security Council.
Document 7: United Nations peacekeeping: As of 29 February 2016, 124 countries were contributing a total of 105,314 personnel in Peacekeeping Operations, with Ethiopia leading the tally (8,324), followed by India (7,695) and Bangladesh (7,525). In June 2013. Pakistan contributed the highest number overall with 8,186 personnel, followed by India (7,878), Bangladesh (7,799), Ethiopia (6,502), Rwanda (4,686), Nigeria (4,684), Nepal (4,495), Jordan (3,374), Ghana (2,859), and Egypt (2,750). As of 28 February 2015, 120 countries were contributing a total of 104,928 personnel in Peacekeeping Operations, with Bangladesh leading the tally (9446). As of March 2008, in addition to military and police personnel, 5,187 international civilian personnel, 2,031 UN Volunteers and 12,036 local civilian personnel worked in UN peacekeeping missions.
Document 8: Eritrea: During the Middle Ages, the Eritrea region was known as Medri Bahri ("sea-land"). The name Eritrea is derived from the ancient Greek name for Red Sea (Ἐρυθρὰ Θάλασσα Erythra Thalassa, based on the adjective ἐρυθρός erythros "red"). It was first formally adopted in 1890, with the formation of Italian Eritrea (Colonia Eritrea). The territory became the Eritrea Governorate within Italian East Africa in 1936. Eritrea was annexed by Ethiopia in 1953 (nominally within a federation until 1962) and an Eritrean Liberation Front formed in 1960. Eritrea gained independence following the 1993 referendum, and the name of the new state was defined as State of Eritrea in the 1997 constitution.[citation needed]
Document 9: Eritrea: Eritrea (/ˌɛrᵻˈtreɪ.ə/ or /ˌɛrᵻˈtriːə/;, officially the State of Eritrea, is a country in East Africa. With its capital at Asmara, it is bordered by Sudan in the west, Ethiopia in the south, and Djibouti in the southeast. The northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea. The nation has a total area of approximately 117,600 km2 (45,406 sq mi), and includes the Dahlak Archipelago and several of the Hanish Islands. Its name Eritrea is based on the Greek name for the Red Sea (Ἐρυθρὰ Θάλασσα Erythra Thalassa), which was first adopted for Italian Eritrea in 1890.
Document 10: United Nations Security Council: The Security Council consists of fifteen members. The great powers that were the victors of World War II -- the Soviet Union (now represented by the Russian Federation), the United Kingdom, France, the Republic of China (now represented by the People's Republic of China), and the United States -- serve as the body's five permanent members. These permanent members can veto any substantive Security Council resolution, including those on the admission of new member states or candidates for Secretary - General. The Security Council also has 10 non-permanent members, elected on a regional basis to serve two - year terms. The body's presidency rotates monthly among its members.
Document 11: United Nations Population Fund: In response, the EU decided to fill the gap left behind by the US under the Sandbaek report. According to its Annual Report for 2008, the UNFPA received its funding mainly from European Governments: Of the total income of M845.3 M, $118 was donated by the Netherlands, $67 M by Sweden, $62 M by Norway, $54 M by Denmark, $53 M by the UK, $52 M by Spain, $19 M by Luxembourg. The European Commission donated further $36 M. The most important non-European donor State was Japan ($36 M). The number of donors exceeded 180 in one year.
Document 12: List of members of the United Nations Security Council: As of July 2011, there are currently 193 members of the United Nations and five permanent members of the Security Council. The other ten seats are assigned amongst the remaining 188 members. As a result, many members have never been on the Security Council. The following list is a summary of all countries, currently 68 modern nations and three historical ones, that have never been a member of the United Nations Security Council. The three historical UN members listed are Tanganyika, Zanzibar, and the Federal Republic of Yugoslavia.
Document 13: 2010 Winter Olympics medal table: Athletes from 26 NOCs won at least one medal, and athletes from 19 of these NOCs secured at least one gold. For the first time, Canada won a gold medal at an Olympic Games it hosted, having failed to do so at both the 1976 Summer Olympics in Montreal and the 1988 Winter Olympics in Calgary. In contrast to the lack of gold medals at these previous Olympics, the Canadian team finished first overall in gold medal wins, and became the first host nation -- since Norway in 1952 -- to lead the gold medal count, with 14 medals. In doing so, it also broke the record for the most gold medals won by a NOC at a single Winter Olympics (the previous was 13, set by the Soviet Union in 1976 and matched by Norway in 2002). The United States placed first in total medals -- its second time doing so in a Winter Games -- and set a new record for most medals won by a NOC at a single Winter Olympics, with 37 (the previous record was 36, established by Germany in 2002). Athletes from Slovakia and Belarus won the first Winter Olympic gold medals for their nations.
Document 14: List of 1960 Winter Olympics medal winners: A total of 131 athletes won medals at the 1960 Games. The Soviet Union was awarded the most medals, with its athletes winning seven gold medals, five silver, and nine bronze, for a total of 21 medals overall. The United States placed second in medal count, with a total of 10 medals, and Germany placed third, with eight medals overall. Of the 30 NOCs competing in the 1960 Games, 14 won at least one medal, with 10 of these winning at least one gold medal. There was a bronze medal awarded to Theron Bailie, USA, for the development of the digital clock used for the first time in downhill skiing.
Document 15: 2008 Summer Olympics medal table: Athletes from 87 countries won medals, leaving 115 countries without a medal, and 54 of them won at least one gold medal. Both of these categories set new records until surpassed in 2016. Athletes from China won the most gold medals, with 48 gold medals. Athletes from the United States won the most total medals, with 112. Afghanistan, Mauritius, Sudan, Tajikistan and Togo won their first Olympic medals. Athletes from Mongolia (which previously held the record for most medals without a gold) and Panama won their first gold medals. Serbian swimmer Milorad Čavić won the first medal for the country as an independent NOC. Serbian athletes have previously won medals as nationals of Yugoslavia and Serbia and Montenegro. Samoa won its first Olympic medal due to medals reallocation after the IOC retested doping samples in 2016.
ground_truth: 1953
sub_queries: who won the most medals in the 1960 winter olympics Answer: The Soviet Union
the us and The Soviet Union became important members in Answer: the United Nations
largest troop contributor to the the United Nations peace keeping mission Answer: Ethiopia
When was Eritrea annexed by Ethiopia ? Answer: 1953