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 system of government is used in the united states of america? 
Knowledge Triplets: President of the United States, government.government_office_or_title.office_holders, m.03fx88m
United States of America, government.governmental_jurisdiction.government_bodies, Federal judiciary of the United States
United States Senator, government.government_office_or_title.governmental_body_if_any, United States Senate
United States of America, location.country.administrative_divisions, Iowa
United States of America, location.country.administrative_divisions, Vermont
United States of America, government.governmental_jurisdiction.government_positions, United States Senator
United States of America, location.country.administrative_divisions, New Jersey
United States of America, location.country.administrative_divisions, Delaware
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc3nx19
United States of America, organization.organization_member.member_of, m.04ddt9h
United States of America, government.governmental_jurisdiction.government_bodies, United States National Security Council
United States Congress, government.governmental_body.jurisdiction, United States of America
UNESCO, organization.organization.founders, United States of America
United States of America, organization.organization_founder.organizations_founded, UNESCO
U.S. Agency for Toxic Substances and Disease Registry, government.governmental_body.jurisdiction, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Kentucky
United States Representative, common.topic.notable_types, Government Office or Title
United States of America, base.aareas.schema.administrative_area.administrative_children, Massachusetts
United States of America, base.schemastaging.context_name.pronunciation, g.125_r6z32
United States of America, base.aareas.schema.administrative_area.administrative_area_type, Sovereign state
United States of America, base.aareas.schema.administrative_area.administrative_children, Rhode Island
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc3xgn3
United States of America, location.country.administrative_divisions, 19012
Supreme Court of the United States, government.governmental_body.body_this_is_a_component_of, Federal judiciary of the United States
United States of America, military.military_combatant.military_commanders, m.04kc46_
Federal government of the United States, government.government.agency, U.S. National Park Service
United States of America, location.country.administrative_divisions, Borinquen
United States of America, government.governmental_jurisdiction.government_positions, United States Representative
United States Congress, government.governmental_body.offices_positions, United States Senator
m.03fx87q, government.government_position_held.district_represented, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, New Mexico
United States Senate, government.governmental_body.offices_positions, United States Senator
United States of America, common.topic.notable_for, g.1255r20f5
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1s0604_gm
United States of America, base.aareas.schema.administrative_area.administrative_children, Arkansas
United States, with Territories, base.aareas.schema.administrative_area.administrative_children, United States of America
m.03fx82m, government.government_position_held.district_represented, United States of America
United States of America, government.political_district.representatives, m.03fx83v
Federal republic, government.form_of_government.countries, United States of America
United States of America, location.country.form_of_government, Constitutional republic
Presidential system, government.form_of_government.countries, Guam
m.03fx88m, government.government_position_held.jurisdiction_of_office, United States of America
m.03fx85y, government.government_position_held.jurisdiction_of_office, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Montana
United States of America, base.aareas.schema.administrative_area.administrative_children, Connecticut
United States of America, base.aareas.schema.administrative_area.administrative_children, South Carolina
United States of America, common.topic.image, 800px-Flag_of_the_United_States.svg.png
David A. Bray, common.topic.subject_of, United States of America
m.03fx83k, government.government_position_held.district_represented, United States of America
United States of America, location.country.administrative_divisions, North Carolina
United States of America, location.country.form_of_government, Presidential system
United States of America, government.governmental_jurisdiction.government_bodies, United States National Economic Council
United States of America, military.military_combatant.military_commanders, m.05nn1s2
United States of America, base.aareas.schema.administrative_area.administrative_children, Arizona
m.03fx87q, government.government_position_held.jurisdiction_of_office, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Maryland
United States of America, military.military_combatant.armed_forces, United States Army
United States of America, freebase.valuenotation.is_reviewed, Time zone(s)
United States of America, base.aareas.schema.administrative_area.administrative_children, Washington
United States of America, base.aareas.schema.administrative_area.administrative_children, New Jersey
President of the United States, government.government_office_or_title.office_holders, m.03fx85y
United States of America, government.governmental_jurisdiction.government_bodies, United States Senate
United States of America, government.political_district.representatives, m.03fx82m
m.03fx85y, government.government_position_held.district_represented, United States of America
United States of America, location.country.internet_tld, us
United States of America, base.aareas.schema.administrative_area.administrative_children, Kansas
United States of America, government.governmental_jurisdiction.government_bodies, U.S. National Park Service
United States of America, government.governmental_jurisdiction.government_positions, Special Advisor for the Consumer Financial Protection Bureau
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc4pwzh
United States of America, government.political_district.representatives, m.03fx85y
U.S. federal district, base.aareas.schema.administrative_area_type.sovereignty, United States of America
U.S. state, base.aareas.schema.administrative_area_type.sovereignty, United States of America
Special Advisor for the Consumer Financial Protection Bureau, government.government_office_or_title.jurisdiction, United States of America
President of the United States, government.government_office_or_title.office_holders, m.03fx8c3
President of the United States, government.government_office_or_title.office_holders, m.03fx83v
United States of America, military.military_combatant.military_commanders, m.0478pm4
United States of America, location.country.administrative_divisions, Michigan
United States of America, military.military_combatant.military_commanders, m.049y36w
United States of America, base.aareas.schema.administrative_area.administrative_children, Wyoming
United States of America, base.aareas.schema.administrative_area.administrative_children, South Dakota
United States Secretary of Housing and Urban Development, government.government_office_or_title.jurisdiction, United States of America
United States of America, freebase.valuenotation.has_no_value, Date dissolved
United States of America, location.country.administrative_divisions, Alaska
United States of America, base.aareas.schema.administrative_area.pertinent_type, U.S. independent city
United States Senator, government.government_office_or_title.governmental_body_if_any, United States Congress
President of the United States, government.government_office_or_title.office_holders, m.03fx83k
United States of America, location.country.administrative_divisions, Rhode Island
United States of America, government.form_of_government.countries, Constitutional republic
United States of America, base.aareas.schema.administrative_area.administrative_children, Vermont
United States of America, base.aareas.schema.administrative_area.administrative_children, Alabama
United States of America, location.country.administrative_divisions, Illinois
United States of America, base.aareas.schema.administrative_area.administrative_children, Nevada
United States of America, military.military_combatant.military_commanders, m.04mntwy
United States of America, organization.organization_member.member_of, m.04dj56v
United States Representative, government.government_office_or_title.jurisdiction, United States of America
Supreme Court of the United States, government.governmental_body.jurisdiction, United States of America
United States of America, location.country.administrative_divisions, Saint Thomas
United States of America, base.aareas.schema.administrative_area.pertinent_type, U.S. state
United States of America, military.military_combatant.military_commanders, m.0gpry7m
Federal government of the United States, government.government.government_for, United States of America
United States of America, government.political_district.representatives, m.03fx83k
United States of America, military.military_combatant.military_commanders, m.0gpry6x
United States of America, freebase.valuenotation.is_reviewed, Minimum wage
United States Congress, government.governmental_body.component_bodies, United States Senate
United States of America, location.country.administrative_divisions, Texas
Presidential system, government.form_of_government.countries, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Texas
United States of America, common.topic.subjects, David A. Bray
United States of America, organization.organization_member.member_of, m.05nlwb9
United States, with Territories, base.aareas.schema.administrative_area.subdividing_place, United States of America
President of the United States, government.government_office_or_title.office_holders, m.03fx8bt
United States of America, base.aareas.schema.administrative_area.administrative_children, Florida
United States of America, government.governmental_jurisdiction.government_positions, Vice President of the United States
United States of America, military.military_combatant.military_commanders, m.049yn2t
United States of America, location.country.first_level_divisions, Washington, D.C.
United States of America, organization.organization_member.member_of, m.04dj48z
United States of America, location.country.administrative_divisions, Oregon
United States of America, base.biblioness.bibs_topic.is_really, United States of America
Constitutional republic, government.form_of_government.countries, United States of America
United States of America, location.country.administrative_divisions, Washington, D.C.
United States of America, organization.organization.parent, m.09qmnrh
United States of America, base.aareas.schema.administrative_area.administrative_children, Missouri
United States of America, location.country.administrative_divisions, California
United States of America, location.country.administrative_divisions, United States Minor Outlying Islands
United States National Economic Council, government.governmental_body.jurisdiction, United States of America
Director of the Consumer Financial Protection Bureau, government.government_office_or_title.jurisdiction, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Tennessee
United States of America, military.military_combatant.military_commanders, m.0gpry74
United States of America, base.unitednations.united_nations_member_state.member_of, m.08__h_w
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc4tsbr
United States of America, military.military_combatant.armed_forces, United Nations Command
United States of America, military.military_combatant.military_commanders, m.04g8rgk
United States Senate, government.governmental_body.body_this_is_a_component_of, United States Congress
U.S. state, base.aareas.schema.administrative_area_type.pertains_to, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Delaware
United States of America, military.military_combatant.military_commanders, m.062m9qd
United States of America, location.country.administrative_divisions, Washington
United States of America, base.aareas.schema.administrative_area.administrative_children, Nebraska
U.S. state, base.aareas.schema.administrative_area_type.subdivides_place, United States of America
United States of America, location.country.administrative_divisions, New York City
United States of America, base.aareas.schema.administrative_area.administrative_children, Michigan
United States of America, location.country.administrative_divisions, Maine
United States of America, base.aareas.schema.administrative_area.administrative_children, California
Federal judiciary of the United States, government.governmental_body.jurisdiction, United States of America
United States of America, government.governmental_jurisdiction.government_bodies, United States Congress
United States of America, organization.organization_member.member_of, m.04dj2l_
United States of America, location.country.administrative_divisions, Ohio
United States of America, base.aareas.schema.administrative_area.pertinent_type, U.S. federal district
United States of America, common.topic.notable_types, Country
United States of America, military.military_combatant.military_commanders, m.0478pmb
Presidential system, government.form_of_government.countries, Mexico
United States of America, military.military_combatant.military_commanders, m.04mntwh
Presidential system, government.form_of_government.countries, South Korea
United States of America, location.country.administrative_divisions, San Francisco
United States of America, base.aareas.schema.administrative_area.administrative_children, New York
United States of America, base.aareas.schema.administrative_area.administrative_children, Indiana
United States of America, religion.religious_leadership_jurisdiction.leader, m.012cdjgk
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc4pgfq
United States of America, location.country.administrative_divisions, Maryland
United States of America, location.country.administrative_divisions, Manhattan
United States of America, military.military_combatant.military_commanders, m.0pl31jm
United States of America, military.military_combatant.casualties, m.0gprnjn
United States of America, military.military_combatant.military_commanders, m.0gpry7c
m.03fx83v, government.government_position_held.jurisdiction_of_office, United States of America
united-states.jpg, common.image.appears_in_topic_gallery, United States of America
United States of America, location.country.internet_tld, edu
United States of America, location.country.administrative_divisions, Guam
United States Dollar, finance.currency.countries_used, United States of America
United States Secretary of Housing and Urban Development, common.topic.notable_types, Government Office or Title
United States of America, law.court_jurisdiction_area.courts, Supreme Court of the United States
United States of America, organization.organization_member.member_of, m.04ddsbr
United States of America, location.country.administrative_divisions, Massachusetts
Federal judiciary of the United States, government.governmental_body.component_bodies, Supreme Court of the United States
United States of America, location.country.administrative_divisions, Pennsylvania
United States of America, military.military_combatant.military_commanders, m.0vmx6kz
United States of America, base.aareas.schema.administrative_area.administrative_children, Georgia
United States of America, base.aareas.schema.administrative_area.administrative_children, Idaho
United States of America, common.topic.image, united-states.jpg
Executive Office of the President of the United States, government.government_agency.jurisdiction, United States of America
data.gov, base.database.database.topic_s, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, North Dakota
United States of America, government.governmental_jurisdiction.government_bodies, Supreme Court of the United States
United States House of Representatives, government.governmental_body.offices_positions, United States Representative
President of the United States, government.government_office_or_title.jurisdiction, United States of America
President of the United States, government.government_office_or_title.category, President
US Federal District is not suited to be the administrative division type for U.S. Federal District., base.uncommon.exception.involves, United States of America
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc48tst
United States of America, location.country.administrative_divisions, Kansas
United States of America, location.country.administrative_divisions, American Samoa
19012, location.administrative_division.country, United States of America
United States of America, location.country.administrative_divisions, Louisiana
United States of America, organization.organization_member.member_of, m.0njx6q9
United States of America, base.aareas.schema.administrative_area.subdividing_type, U.S. state
United States of America, military.military_combatant.military_commanders, m.04kc46r
United States of America, base.sharing.sharing_location.shared_here, m.0gkhcxv
United States of America, base.aareas.schema.administrative_area.administrative_children, Utah
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.11b71qnf7h
U.S. National Park Service, government.governmental_body.jurisdiction, United States of America
m.03fx88m, government.government_position_held.district_represented, United States of America
United States of America, organization.organization_member.member_of, m.04c_zfp
United States of America, location.country.administrative_divisions, New York
United States of America, government.political_district.representatives, m.03fx88m
United States of America, military.military_combatant.military_commanders, m.0hcr57k
United States of America, location.country.administrative_divisions, West Virginia
United States National Security Council, government.governmental_body.jurisdiction, United States of America
m.03fx8bt, government.government_position_held.district_represented, United States of America
United States of America, organization.organization_member.member_of, m.05kysvl
United States of America, government.governmental_jurisdiction.government_bodies, U.S. Agency for Toxic Substances and Disease Registry
United States Department of State, government.government_agency.jurisdiction, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, West Virginia
m.03fx83v, government.government_position_held.district_represented, United States of America
m.03fx8c3, government.government_position_held.district_represented, United States of America
President of the United States, common.topic.notable_types, Government Office or Title
United States of America, military.military_combatant.military_commanders, m.04mntw7
United States, with Territories, base.aareas.schema.earth.sovereign_domain.sovereign_state, United States of America
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc3w9r4
United States of America, location.country.administrative_divisions, Connecticut
United States of America, common.topic.article, m.09c7wb
United States Senate, government.governmental_body.jurisdiction, United States of America
m.0dkbjtj, government.government_position_held.district_represented, United States of America
United States of America, location.country.administrative_divisions, Arizona
President of the United States, government.government_office_or_title.office_holders, m.03fx82m
United States of America, location.country.capital, Washington, D.C.
United States of America, military.military_combatant.military_commanders, m.049y287
United States of America, military.military_combatant.military_commanders, m.07yl5ks
United States Representative, government.government_office_or_title.governmental_body_if_any, United States Congress
United States of America, location.administrative_division.first_level_division_of, United States, with Territories
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc39cd2
Supreme Court of the United States, law.court.jurisdiction, United States of America
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc37_k2
United States of America, government.governmental_jurisdiction.government_positions, President of the United States
United States of America, organization.organization_member.member_of, m.03w60cf
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc3qkrl
United States of America, base.firsts.first_achievement_category.firsts, m.04wyfrp
Executive Office of the President of the United States, government.governmental_body.jurisdiction, United States of America
United States of America, freebase.valuenotation.is_reviewed, Official website
United States Senator, government.government_office_or_title.jurisdiction, United States of America
United States of America, government.form_of_government.countries, Federal republic
United States of America, organization.organization_member.member_of, m.04ddtz3
United States of America, government.political_district.representatives, m.03fx7qq
United States of America, base.aareas.schema.administrative_area.administrative_children, Colorado
United States of America, base.aareas.schema.administrative_area.administrative_children, Louisiana
United States of America, location.country.administrative_divisions, Chicago
United States of America, base.aareas.schema.administrative_area.administrative_children, North Carolina
United States of America, military.military_combatant.military_commanders, m.05nn1ry
Constitutional republic, government.form_of_government.countries, American Samoa
m.03fx7qq, government.government_position_held.district_represented, United States of America
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc534gx
United States of America, base.aareas.schema.administrative_area.administrative_children, Oklahoma
United States of America, base.aareas.schema.administrative_area.administrative_children, New Hampshire
United States Congress, government.governmental_body.offices_positions, United States Representative
United States House of Representatives, government.governmental_body.jurisdiction, United States of America
United States of America, organization.organization_member.member_of, m.04dj2xb
United States of America, government.governmental_jurisdiction.government_positions, First Lady of the United States
United States of America, location.country.administrative_divisions, Minnesota
United States of America, location.country.form_of_government, Presidential system
United States of America, government.governmental_jurisdiction.government_bodies, United States National Commission for the United Nations Educational, Scientific and Cultural Organization
United States of America, location.country.administrative_divisions, New Hampshire
United States of America, base.aareas.schema.administrative_area.administrative_children, Illinois
United States of America, organization.organization_member.member_of, m.04c_z8g
United States of America, military.military_combatant.armed_forces, United States Volunteers
United States of America, government.governmental_jurisdiction.government_positions, United States Secretary of Housing and Urban Development
United States of America, government.political_district.representatives, m.0dkbjtj
United States of America, military.military_combatant.military_commanders, m.049yl7d
United States of America, government.governmental_jurisdiction.government_bodies, United States House of Representatives
United States of America, government.governmental_jurisdiction.government_bodies, Executive Office of the President of the United States
United States National Commission for the United Nations Educational, Scientific and Cultural Organization, government.governmental_body.jurisdiction, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Pennsylvania
United States of America, government.governmental_jurisdiction.government_bodies, United States Department of State
United States of America, location.country.form_of_government, Federal republic
United States of America, government.political_district.representatives, m.03fx8c3
United States of America, base.firsts.first_achievement_category.firsts, m.0g9jx_k
m.03fx82m, government.government_position_held.jurisdiction_of_office, United States of America
United States of America, location.country.internet_tld, gov
United States of America, location.country.internet_tld, mil
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc4kjrs
United States of America, base.aareas.schema.administrative_area.administrative_children, Mississippi
United States of America, base.aareas.schema.administrative_area.administrative_children, Wisconsin
United States of America, government.political_district.representatives, m.03fx7rc
United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc4vt_5
United States of America, base.aareas.schema.administrative_area.administrative_children, Maine
United States of America, location.country.administrative_divisions, Virginia
First Lady of the United States, government.government_office_or_title.jurisdiction, United States of America
United States of America, base.aareas.schema.administrative_area.subdivides_place, United States, with Territories
United States of America, base.aareas.schema.administrative_area.administrative_children, Washington, D.C.
United States of America, base.locations.countries.continent, North America
United States of America, location.country.administrative_divisions, Colorado
United States of America, base.aareas.schema.administrative_area.pertinent_type, U.S. county
United States of America, government.political_district.representatives, m.03fx7hj
U.S. state, base.aareas.schema.administrative_area_type.iso_country, United States of America
United States of America, location.country.administrative_divisions, New Mexico
Assistant Secretary of Commerce and Commissioner of Patents and Trademarks, government.government_office_or_title.jurisdiction, United States of America
m.03fx7rc, government.government_position_held.district_represented, United States of America
United States of America, base.aareas.schema.administrative_area.administrative_children, Ohio
United States of America, base.aareas.schema.administrative_area.administrative_children, Minnesota
Presidential system, government.form_of_government.countries, Northern Mariana Islands
United States of America, military.military_combatant.military_commanders, m.02h77w4
United States of America, location.country.administrative_divisions, Indiana
United States of America, location.country.currency_used, United States Dollar
United States of America, government.governmental_jurisdiction.government_positions, Director of the Consumer Financial Protection Bureau
United States of America, government.political_district.representatives, m.03fx87q
United States House of Representatives, government.governmental_body.body_this_is_a_component_of, United States Congress
United States of America, location.country.administrative_divisions, Florida
United States of America, military.military_combatant.military_commanders, m.04jx14r
Presidential system, government.form_of_government.countries, Marshall Islands
United States of America, military.military_combatant.military_commanders, m.049yl2y
United States of America, base.uncommon.topic.exceptions, US Federal District is not suited to be the administrative division type for U.S. Federal District.
United States of America, base.schemastaging.context_name.pronunciation, m.010r7f0z
m.03fx8bt, government.government_position_held.jurisdiction_of_office, United States of America
United States of America, location.country.administrative_divisions, Utah
m.03fx8c3, government.government_position_held.jurisdiction_of_office, United States of America
United States of America, military.military_combatant.military_commanders, m.0vmx69n
United States of America, base.aareas.schema.administrative_area.administrative_children, Hawaii
United States of America, base.locations.countries.planet, Earth
U.S. National Park Service, government.government_agency.government, Federal government of the United States
United States of America, base.aareas.schema.administrative_area.administrative_children, Alaska
United States of America, base.aareas.schema.administrative_area.administrative_parent, United States, with Territories
United States Representative, government.government_office_or_title.governmental_body_if_any, United States House of Representatives
United States of America, military.military_combatant.military_commanders, m.049y2wb
United States of America, base.firsts.first_achievement_category.firsts, m.04x258g
United States of America, military.military_combatant.military_commanders, m.04mntw0
United States of America, base.skosbase.vocabulary_equivalent_topic.narrower_concept, United States--Economic conditions--1961-1971
United States of America, base.aareas.schema.administrative_area.subdividing_type, U.S. federal district
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President of the United States, government.government_office_or_title.office_holders, m.03fx87q
United States of America, base.database.database_topic.database_s_for_this_topic, data.gov
United States of America, base.aareas.schema.administrative_area.administrative_children, Oregon
Vice President of the United States, government.government_office_or_title.jurisdiction, United States of America
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United States of America, organization.organization_member.member_of, m.03wzc6t
United States of America, government.governmental_jurisdiction.government_positions, Assistant Secretary of Commerce and Commissioner of Patents and Trademarks
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United States of America, location.country.administrative_divisions, Nevada
United States of America, organization.organization_member.member_of, m.046xjzn
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United States of America, government.political_district.representatives, m.03fx8bt
United States of America, location.country.administrative_divisions, Hawaii
m.03k0799, government.national_anthem_of_a_country.country, United States of America
United States of America, base.firsts.first_achievement_category.firsts, m.04zr93l
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United States of America, location.statistical_region.gender_balance_members_of_parliament, g.1hhc4x3d7
United States of America, organization.organization_member.member_of, m.04p8y17
United States of America, government.governmental_jurisdiction.government, Federal government of the United States
United States of America, freebase.valuenotation.is_reviewed, Currency Used
United States Congress, government.governmental_body.component_bodies, United States House of Representatives
United States of America, location.country.administrative_divisions, Idaho

Answer: Presidential system
Federal republic
Constitutional republic