user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: What country, which the Niger River flows through, also exports to the United States of America? 
Knowledge Triplets: United States of America, location.statistical_region.places_exported_to, m.049373z
Niger, olympics.olympic_participating_country.olympics_participated_in, 2008 Summer Olympics
Niger River, location.location.partially_containedby, Guinea
United States of America, organization.organization_founder.organizations_founded, World Trade Organization
United States of America, common.topic.image, united-states.jpg
United States of America, location.statistical_region.major_imports, m.04g4sbb
m.049375p, location.imports_and_exports.imported_from, United States of America
m.0493788, location.imports_and_exports.currency, United States Dollar
Niger, location.location.partiallycontains, m.0wg8zq2
m.04938pv, location.imports_and_exports.imported_from, United States of America
m.049376n, location.imports_and_exports.exported_to, United States of America
United States of America, location.location.partially_contains, Yukon River
United States of America, government.form_of_government.countries, Federal republic
m.04xd0mv, location.imports_and_exports.imported_from, United States of America
Federal republic, location.country.form_of_government, Nigeria
Country, common.topic.notable_types, Nigeria
m.04bccr9, location.imports_and_exports.imported_from, United States of America
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3yf71
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc3j2pk
United States of America, location.statistical_region.places_exported_to, m.0493756
United States of America, location.country.form_of_government, Federal republic
m.049376n, location.imports_and_exports.currency, United States Dollar
Map of the Niger River basin and part of the Guinea highlands towards the southwest, common.image.size, m.0291hmd
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc38c_9
United States of America, location.statistical_region.places_exported_to, m.04fl3np
Niger River, common.topic.image, Niger river at Koulikoro
United States of America, location.statistical_region.places_exported_to, m.04fhpj6
Yukon River, geography.river.basin_countries, United States of America
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4cg5y
United States of America, base.biblioness.bibs_topic.subsumes, United States of America
Niger River, location.location.partially_containedby, Nigeria
United States of America, location.statistical_region.places_exported_to, m.04938pv
Guinea Highlands, common.topic.image, Map of the Niger River basin and part of the Guinea highlands towards the southwest
United States of America, location.statistical_region.places_exported_to, m.049374l
United States of America, location.statistical_region.places_imported_from, m.04939hm
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc38vb7
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3dz46
m.0493751, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.places_exported_to, m.049374x
m.049378y, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc47k9y
United States of America, location.location.partially_contains, Souris River
m.0493751, location.imports_and_exports.currency, United States Dollar
United States of America, location.country.administrative_divisions, Borinquen
m.0493774, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.major_imports, m.04g4sb5
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc48hy6
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc54r1t
m.049374r, location.imports_and_exports.exported_to, United States of America
m.0493756, location.imports_and_exports.currency, United States Dollar
m.049376_, location.imports_and_exports.currency, United States Dollar
Stikine River, geography.river.basin_countries, United States of America
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3bjhj
Niamey, location.administrative_division.country, Niger
United States of America, language.human_language.main_country, English Language
m.049376h, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc52mf7
Niger, freebase.valuenotation.is_reviewed, Time zone(s)
Meduxnekeag River, geography.river.basin_countries, United States of America
m.049375v, location.imports_and_exports.currency, United States Dollar
m.049375c, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.major_exports, m.04g4s8k
Map of the Niger River basin and part of the Guinea highlands towards the southwest, common.image.appears_in_topic_gallery, Niger Basin Authority
United States of America, location.country.administrative_divisions, 19012
United States of America, location.location.partially_contains, Skagit River
United States of America, location.location.partially_contains, Richelieu River
m.0493774, location.imports_and_exports.currency, United States Dollar
m.04fl3qp, location.imports_and_exports.exported_to, United States of America
United States of America, common.topic.notable_for, g.1255r20f5
United States of America, location.country.administrative_divisions, New Mexico
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4wt74
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.1hhc474jl
m.049374l, location.imports_and_exports.currency, United States Dollar
United States of America, location.country.capital, Washington, D.C.
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1s05zsygf
Niger River, location.location.containedby, Africa
m.049376v, location.imports_and_exports.imported_from, Nigeria
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc459cv
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc52vcs
Water Music, book.written_work.subjects, Niger River
United States of America, location.location.partially_contains, Stikine River
m.049375c, location.imports_and_exports.imported_from, United States of America
Niger River, location.location.partially_contained_by, m.0wg8_d7
United States of America, location.statistical_region.places_imported_from, m.04c6sht
United States of America, base.locations.countries.planet, Earth
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4xffs
m.049377z, location.imports_and_exports.currency, United States Dollar
United States of America, location.country.languages_spoken, Lojban
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc54y9t
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc53pms
United States of America, location.country.internet_tld, gov
m.04fhph1, location.imports_and_exports.exported_to, United States of America
m.049377n, location.imports_and_exports.imported_from, United States of America
United States of America, common.topic.article, m.09c7wb
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc39kmb
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc49ndr
Niger River, location.location.partially_containedby, Benin
United States of America, location.location.partially_contains, Porcupine River
m.0493797, location.imports_and_exports.currency, United States Dollar
Niger River, base.ontologies.ontology_instance.equivalent_instances, m.07nffdb
Niger river at Koulikoro, common.image.size, m.0kjks2
Map of the Niger River basin and part of the Guinea highlands towards the southwest, common.image.appears_in_topic_gallery, Azawagh
m.049376v, location.imports_and_exports.imported_from, Nigeria
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3zldv
m.04fl3np, location.imports_and_exports.imported_from, United States of America
m.0493743, location.imports_and_exports.exported_to, United States of America
Sovereign state, base.aareas.schema.administrative_area.administrative_area_type, Nigeria
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4rrqv
United States of America, base.locations.countries.continent, North America
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc37pgy
United States of America, location.location.partially_contains, Kettle River
Niger River, geography.river.basin_countries, Nigeria
Niger River, geography.river.mouth, Gulf of Guinea
United States of America, location.statistical_region.merchandise_trade_percent_of_gdp, g.1hhc4lgkd
United States of America, location.location.partially_contains, St. Marys River
Niger River, location.location.events, Richard and John Lander Niger Expeditition 1830
United States of America, location.statistical_region.places_exported_to, m.049379x
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4kwcf
m.049375v, location.imports_and_exports.imported_from, United States of America
Africa, base.locations.continents.countries_within, Niger
m.049377t, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.merchandise_trade_percent_of_gdp, g.1hhc425z6
United States of America, common.topic.notable_types, Country
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.1hhc4001z
Niger, location.country.capital, Niamey
Niger, base.aareas.schema.administrative_area.administrative_parent, Earth
United States of America, location.statistical_region.places_exported_to, m.04fxlgq
Niger river at Koulikoro, common.image.appears_in_topic_gallery, Koulikoro Cercle
United States of America, location.location.partially_contains, White River
United States of America, common.topic.notable_types, Country
Aroostook River, geography.river.basin_countries, United States of America
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.1hhc4mhp2
United States of America, location.statistical_region.major_exports, m.04g4s8q
m.0493743, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.1hhc534c2
United States of America, location.country.first_level_divisions, New Mexico
Niger River, location.location.partially_contained_by, m.0wg9h4x
m.0493783, location.imports_and_exports.exported_to, United States of America
1952 Summer Olympics, olympics.olympic_games.participating_countries, Nigeria
m.04bfg3x, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4krtn
Niger River, location.location.partially_containedby, Nigeria
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3yv4n
Niger River, geography.river.cities, Niamey
m.049376_, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.places_exported_to, m.049377t
United States of America, location.statistical_region.places_exported_to, m.049377n
Niger River, location.location.partially_containedby, Niger
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc53smg
m.049378y, location.imports_and_exports.currency, United States Dollar
United States of America, location.country.internet_tld, us
United States of America, location.statistical_region.major_imports, m.04g4sbz
m.049377n, location.imports_and_exports.currency, United States Dollar
Koulikoro Cercle, common.topic.image, Niger river at Koulikoro
Niger, base.locations.countries.continent, Africa
m.049375j, location.imports_and_exports.currency, United States Dollar
Guinea, location.location.partially_contains, Niger River
United States of America, location.statistical_region.places_exported_to, m.049375c
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc37h5q
United States of America, base.aareas.schema.administrative_area.administrative_area_type, Sovereign state
m.04939hm, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc3p9lj
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4j8mm
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.1hhc3jqkc
United States of America, location.country.internet_tld, edu
m.0493792, location.imports_and_exports.currency, United States Dollar
United States of America, location.location.partially_contains, Fortymile River
United States of America, location.location.partially_contains, Missisquoi River
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4wpjk
United States of America, location.location.partially_contains, Pembina River
Niger River, common.topic.article, m.05ct6
m.0cqfbfm, location.imports_and_exports.exported_to, United States of America
United States of America, location.location.partially_contains, New River
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.11b71v6t4q
Niger River, geography.river.cities, Tembakounda
Richard and John Lander Niger Expeditition 1830, common.topic.notable_for, g.125h43zwm
m.04xd0mv, location.imports_and_exports.currency, United States Dollar
m.049376v, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc54vgh
Niger, location.location.containedby, Africa
Alsek River, geography.river.basin_countries, United States of America
m.049376v, location.imports_and_exports.exported_to, United States of America
m.049376h, location.imports_and_exports.imported_from, United States of America
Niamey, base.biblioness.bibs_location.country, Niger
Niger River, geography.river.origin, Guinea Highlands
m.049377z, location.imports_and_exports.exported_to, United States of America
World Trade Organization, organization.organization.founders, Nigeria
Niger, location.country.administrative_divisions, Niamey
m.049375p, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4b1w3
m.0493748, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4g936
Map of the Niger River basin and part of the Guinea highlands towards the southwest, common.image.appears_in_topic_gallery, Niger River
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4w13f
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1q5k0ck_d
Red River of the North, geography.river.basin_countries, United States of America
Niger River, geography.river.cities, Lokoja
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc3szn9
m.0493792, location.imports_and_exports.imported_from, United States of America
Niger River, geography.river.basin_countries, Benin
Niger River, location.location.partially_contained_by, m.0wg9jq9
United States of America, location.country.administrative_divisions, American Samoa
Niger, location.location.partially_contains, Niger River
New River, geography.river.basin_countries, United States of America
United States of America, location.statistical_region.major_imports, m.04g4sbn
m.0dm4wc4, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4my4j
m.049375j, location.imports_and_exports.imported_from, United States of America
m.048_4q3, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4n73n
Benin, location.location.partially_contains, Niger River
Niger River, geography.river.basin_countries, Guinea
Niger River, geography.river.cities, Bamako
United States of America, location.location.partially_contains, Tijuana River
United States of America, olympics.olympic_participating_country.olympics_participated_in, 1952 Summer Olympics
Niger River, common.topic.image, Map of the Niger River basin and part of the Guinea highlands towards the southwest
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3yf0n
United States of America, location.location.partially_contains, Frenchman River
m.0493783, location.imports_and_exports.currency, United States Dollar
m.049377b, location.imports_and_exports.exported_to, United States of America
Niger River, common.topic.notable_for, g.1256x4th6
m.049374x, location.imports_and_exports.imported_from, United States of America
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3v297
m.04fxlgq, location.imports_and_exports.imported_from, United States of America
Tijuana River, geography.river.basin_countries, United States of America
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4p55t
United States of America, location.statistical_region.places_exported_to, m.04bccr9
United States of America, location.statistical_region.merchandise_trade_percent_of_gdp, g.1hhc4h4zm
United States of America, location.country.administrative_divisions, Washington
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3l9c6
Fortymile River, geography.river.basin_countries, United States of America
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.12tb6gb1z
Niger River, location.location.partially_contained_by, m.0wg8zq2
United States of America, location.location.partially_contains, Colorado River
United States of America, location.location.partially_contains, Roseau River
m.0wg9jq9, location.partial_containment_relationship.partially_contains, Niger River
m.049374f, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.places_imported_from, m.04fxlft
United States of America, common.topic.subjects, David A. Bray
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3h6v4
United States of America, location.statistical_region.places_exported_to, m.049375v
m.049377t, location.imports_and_exports.imported_from, United States of America
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.12cp_jm9v
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc549mj
m.049373t, location.imports_and_exports.exported_to, United States of America
m.04bc95w, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.merchandise_trade_percent_of_gdp, g.1hhc39cdh
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4f7jp
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3_815
Niger River, location.location.partially_contained_by, m.0wg8_56
m.0wg8_56, location.partial_containment_relationship.partially_contains, Niger River
m.0493756, location.imports_and_exports.imported_from, United States of America
m.049373z, location.imports_and_exports.currency, United States Dollar
19012, location.administrative_division.country, United States of America
Niger, common.topic.notable_types, Country
Niger river at Koulikoro, common.image.appears_in_topic_gallery, Niger River
United States of America, location.statistical_region.places_exported_to, m.04xd0mv
m.0wg8zq2, location.partial_containment_relationship.partially_contained_by, Niger
m.049374f, location.imports_and_exports.exported_to, United States of America
m.049373t, location.imports_and_exports.currency, United States Dollar
United States of America, location.location.partially_contains, Similkameen River
United States of America, location.location.partially_contains, Alsek River
Map of the Niger River basin and part of the Guinea highlands towards the southwest, common.image.appears_in_topic_gallery, African Association
UNESCO, organization.organization.founders, United States of America
English Language, location.country.languages_spoken, Nigeria
Saint Francis River, geography.river.basin_countries, United States of America
m.0wg9h4x, location.partial_containment_relationship.partially_contains, Niger River
Saint Lawrence River, geography.river.basin_countries, United States of America
Prozac Nation, film.film.country, United States of America
United States of America, location.location.partially_contains, Kootenay River
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc385b7
Niger River, geography.river.cities, Timbuktu
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3mshz
Richard and John Lander Niger Expeditition 1830, time.event.locations, Niger River
Colorado River, geography.river.basin_countries, United States of America
m.049377h, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.places_exported_to, m.0493748
United States of America, location.statistical_region.merchandise_trade_percent_of_gdp, g.1hhc3g30m
Presidential system, government.form_of_government.countries, Nigeria
m.04fxlft, location.imports_and_exports.exported_to, United States of America
m.04c6sht, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.major_exports, m.04g4s8w
m.04fhpj6, location.imports_and_exports.imported_from, United States of America
United States of America, location.location.partially_contains, Aroostook River
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4g99t
Nigeria, location.statistical_region.places_exported_to, m.049376v
Niger River, location.location.partially_containedby, Mali
United States of America, location.statistical_region.places_exported_to, m.0493797
United States of America, location.location.partially_contains, Columbia River
m.049379x, location.imports_and_exports.imported_from, United States of America
United States of America, location.statistical_region.merchandise_trade_percent_of_gdp, g.11b71srh9q
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc41c61
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4tk14
United States of America, location.location.partially_contains, Meduxnekeag River
m.049373z, location.imports_and_exports.imported_from, United States of America
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc3zpxm
United States of America, location.country.national_anthem, m.03k0799
m.0wg8zq2, location.partial_containment_relationship.partially_contains, Niger River
m.049377b, location.imports_and_exports.currency, United States Dollar
United States of America, base.biblioness.bibs_topic.is_really, United States of America
United States of America, location.statistical_region.places_exported_to, m.049375j
United States of America, location.location.partially_contains, Okanogan River
Niger River, geography.river.cities, Onitsha
United States of America, location.location.partially_contains, Red River of the North
m.0cl9ldp, location.imports_and_exports.exported_to, United States of America
United States of America, location.country.languages_spoken, Saurashtra language
United States of America, location.country.internet_tld, mil
United States of America, location.statistical_region.places_imported_from, m.049376v
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.1hhc3y2ym
Map of the Niger River basin and part of the Guinea highlands towards the southwest, common.image.appears_in_topic_gallery, Guinea Highlands
United States of America, location.country.currency_used, United States Dollar
Nigeria, location.location.partially_contains, Niger River
Mali, location.location.partially_contains, Niger River
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.1hhc4tnvd
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc4zqz7
United States of America, location.statistical_region.places_exported_to, m.049376h
m.0493788, location.imports_and_exports.exported_to, United States of America
United States of America, location.statistical_region.places_exported_to, m.0493792
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc3j5s8
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc40yyh
Earth, base.aareas.schema.administrative_area.administrative_parent, Nigeria
United States of America, location.statistical_region.major_imports, m.04g4sbt
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc42f58
United States of America, location.location.partially_contains, Pend Oreille River
Niger, location.location.time_zones, West Africa Time Zone
Skagit River, geography.river.basin_countries, United States of America
United States of America, location.statistical_region.foreign_direct_investment_net_inflows, g.11b71tfphq
Niger River, common.topic.notable_types, River
m.0493748, location.imports_and_exports.imported_from, United States of America
m.07nffdb, base.ontologies.ontology_instance_mapping.freebase_topic, Niger River
Niger River, geography.river.basin_countries, Mali
Niger River, geography.river.basin_countries, Niger
Richard and John Lander Niger Expeditition 1830, common.topic.notable_types, Event
United States of America, location.country.first_level_divisions, Washington
m.0wg8_d7, location.partial_containment_relationship.partially_contains, Niger River
m.049374r, location.imports_and_exports.currency, United States Dollar
United States of America, location.statistical_region.major_exports, m.04g4s90
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc3v5rc
m.0493797, location.imports_and_exports.imported_from, United States of America
United States of America, location.location.partially_contains, Milk River
United States of America, location.statistical_region.high_tech_as_percent_of_manufactured_exports, g.1hhc4006c
Niger River, book.book_subject.works, Water Music
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc549mh
United States of America, location.statistical_region.places_exported_to, m.049375p
United States of America, government.form_of_government.countries, Presidential system
Niger River, base.schemastaging.context_name.pronunciation, g.125_r2vgq
United States of America, location.statistical_region.trade_balance_as_percent_of_gdp, g.1hhc51plr
m.049374l, location.imports_and_exports.imported_from, United States of America

Answer: Nigeria