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Afghanistanpresidential Islamic republic
Albaniaparliamentary republic
Algeriapresidential republic
American Samoaunincorporated, unorganized Territory of the US with local self-government; republican form of government with separate executive, legislative, and judicial branches;
Andorraparliamentary democracy (since March 1993) that retains its chiefs of state in the form of a co-principality; the two princes are the President of France and Bishop of Seu d'Urgell, Spain
Angolapresidential republic
Anguillaparliamentary democracy (House of Assembly); self-governing overseas territory of the UK
Antarctica

Antarctic Treaty Summary - the Antarctic region is governed by a system known as the Antarctic Treaty system; the system includes: 1. the Antarctic Treaty, signed on 1 December 1959 and entered into force on 23 June 1961, which establishes the legal framework for the management of Antarctica, 2. Measures, Decisions, and Resolutions adopted at Antarctic Treaty Consultative Meetings, 3. The Convention for the Conservation of Antarctic Seals (1972), 4. The Convention for the Conservation of Antarctic Marine Living Resources (1980), and 5. The Protocol on Environmental Protection to the Antarctic Treaty (1991); the Antarctic Treaty Consultative Meetings operate by consensus (not by vote) of all consultative parties at annual Treaty meetings; by January 2016, there were 53 treaty member nations: 29 consultative and 24 non-consultative; consultative (decision-making) members include the seven nations that claim portions of Antarctica as national territory (some claims overlap) and 22 non-claimant nations; the US and Russia have reserved the right to make claims; the US does not recognize the claims of others; Antarctica is administered through meetings of the consultative member nations; measures adopted at these meetings are carried out by these member nations (with respect to their own nationals and operations) in accordance with their own national laws; the years in parentheses indicate when a consultative member-nation acceded to the Treaty and when it was accepted as a consultative member, while no date indicates the country was an original 1959 treaty signatory; claimant nations are - Argentina, Australia, Chile, France, NZ, Norway, and the UK; nonclaimant consultative nations are - Belgium, Brazil (1975/1983), Bulgaria (1978/1998), China (1983/1985), Czech Republic (1962/2014), Ecuador (1987/1990), Finland (1984/1989), Germany (1979/1981), India (1983/1983), Italy (1981/1987), Japan, South Korea (1986/1989), Netherlands (1967/1990), Peru (1981/1989), Poland (1961/1977), Russia, South Africa, Spain (1982/1988), Sweden (1984/1988), Ukraine (1992/2004), Uruguay (1980/1985), and the US; non-consultative members, with year of accession in parentheses, are - Austria (1987), Belarus (2006), Canada (1988), Colombia (1989), Cuba (1984), Denmark (1965), Estonia (2001), Greece (1987), Guatemala (1991), Hungary (1984), Iceland (2015), Kazakhstan (2015), North Korea (1987), Malaysia (2011), Monaco (2008), Mongolia (2015), Pakistan (2012), Papua New Guinea (1981), Portugal (2010), Romania (1971), Slovakia (1962/1993), Switzerland (1990), Turkey (1996), and Venezuela (1999); note - Czechoslovakia acceded to the Treaty in 1962 and separated into the Czech Republic and Slovakia in 1993; Article 1 - area to be used for peaceful purposes only; military activity, such as weapons testing, is prohibited, but military personnel and equipment may be used for scientific research or any other peaceful purpose; Article 2 - freedom of scientific investigation and cooperation shall continue; Article 3 - free exchange of information and personnel, cooperation with the UN and other international agencies; Article 4 - does not recognize, dispute, or establish territorial claims and no new claims shall be asserted while the treaty is in force; Article 5 - prohibits nuclear explosions or disposal of radioactive wastes;Article 6 - includes under the treaty all land and ice shelves south of 60 degrees 00 minutes south and reserves high seas rights; Article 7 - treaty-state observers have free access, including aerial observation, to any area and may inspect all stations, installations, and equipment; advance notice of all expeditions and of the introduction of military personnel must be given; Article 8 - allows for jurisdiction over observers and scientists by their own states; Article 9 - frequent consultative meetings take place among member nations; Article 10 - treaty states will discourage activities by any country in Antarctica that are contrary to the treaty; Article 11 - disputes to be settled peacefully by the parties concerned or, ultimately, by the ICJ; Articles 12, 13, 14 - deal with upholding, interpreting, and amending the treaty among involved nations; other agreements - some 200 measures adopted at treaty consultative meetings and approved by governments; the Protocol on Environmental Protection to the Antarctic Treaty was signed 4 October 1991 and entered into force 14 January 1998; this agreement provides for the protection of the Antarctic environment and includes five annexes that have entered into force: 1) environmental impact assessment, 2) conservation of Antarctic fauna and flora, 3) waste disposal and waste management, 4) prevention of marine pollution, 5) area protection and management; a sixth annex addressing liability arising from environmental emergencies has yet to enter into force; the Protocol prohibits all activities relating to mineral resources except scientific research; a permanent Antarctic Treaty Secretariat was established in 2004 in Buenos Aires, Argentina

Antigua and Barbudaparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Argentinapresidential republic
Armeniaparliamentary democracy; note - constitutional changes adopted in December 2015 transformed the government to a parliamentary system
Arubaparliamentary democracy; part of the Kingdom of the Netherlands
Australiafederal parliamentary democracy under a constitutional monarchy; a Commonwealth realm
Austriafederal parliamentary republic
Azerbaijanpresidential republic
Bahamas, Theparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Bahrainconstitutional monarchy
Bangladeshparliamentary republic
Barbadosparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Belaruspresidential republic in name, although in fact a dictatorship
Belgiumfederal parliamentary democracy under a constitutional monarchy
Belizeparliamentary democracy (National Assembly) under a constitutional monarchy; a Commonwealth realm
Beninpresidential republic
BermudaOverseas Territory of the UK with limited self-government; parliamentary democracy
Bhutanconstitutional monarchy
Boliviapresidential republic
Bosnia and Herzegovinaparliamentary republic
Botswanaparliamentary republic
Brazilfederal presidential republic
British Virgin IslandsOverseas Territory of the UK with limited self-government; parliamentary democracy
Bruneiabsolute monarchy or sultanate
Bulgariaparliamentary republic
Burkina Fasopresidential republic
Burmaparliamentary republic
Burundipresidential republic
Cambodiaparliamentary constitutional monarchy
Cameroonpresidential republic
Canadafederal parliamentary democracy (Parliament of Canada) under a constitutional monarchy; a Commonwealth realm; federal and state authorities and responsibilities regulated in constitution
Cayman Islandsparliamentary democracy; self-governing overseas territory of the UK
Central African Republicpresidential republic
Chadpresidential republic
Chilepresidential republic
Chinacommunist party-led state
Christmas Islandnon-self-governing overseas territory of Australia
Cocos (Keeling) Islandsnon-self-governing overseas territory of Australia
Colombiapresidential republic
Comorosfederal presidential republic
Congo, Democratic Republic of thesemi-presidential republic
Congo, Republic of thepresidential republic
Cook Islandsparliamentary democracy
Costa Ricapresidential republic
Cote d'Ivoirepresidential republic
Croatiaparliamentary republic
Cubacommunist state
Curacao

parliamentary democracy

CyprusRepublic of Cyprus - presidential republic; "Turkish Republic of Northern Cyprus" (self-declared) - parliamentary republic with enhanced presidency

note: a separation of the two main ethnic communities inhabiting the island began following the outbreak of communal strife in 1963; this separation was further solidified when a Greek military-junta-supported coup attempt prompted the Turkish military intervention in July 1974 that gave the Turkish Cypriots de facto control in the north; Greek Cypriots control the only internationally recognized government on the island; on 15 November 1983, then Turkish Cypriot "President" Rauf DENKTAS declared independence and the formation of the "TRNC," which is recognized only by Turkey
Denmarkparliamentary constitutional monarchy
Djiboutipresidential republic
Dominicaparliamentary republic
Dominican Republicpresidential republic
Ecuadorpresidential republic
Egyptpresidential republic
El Salvadorpresidential republic
Equatorial Guineapresidential republic
Eritreapresidential republic
Estoniaparliamentary republic
Ethiopiafederal parliamentary republic
Falkland Islands (Islas Malvinas)parliamentary democracy (Legislative Assembly); self-governing overseas territory of the UK
Faroe Islandsparliamentary democracy (Faroese Parliament); part of the Kingdom of Denmark
Fijiparliamentary republic
Finlandparliamentary republic
Francesemi-presidential republic
French Polynesiaparliamentary democracy (Assembly of French Polynesia); an overseas collectivity of France
Gabonpresidential republic
Gambia, Thepresidential republic
Georgiasemi-presidential republic
Germanyfederal parliamentary republic
Ghanapresidential republic
Gibraltarparliamentary democracy (Parliament); self-governing overseas territory of the UK
Greeceparliamentary republic
Greenlandparliamentary democracy (Parliament of Greenland or Inatsisartut)
Grenadaparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Guamrepublican form of government with separate executive, legislative, and judicial branches; unincorporated organized territory of the US with local self-government
Guatemalapresidential republic
Guernseyparliamentary democracy (States of Deliberation)
Guineapresidential republic
Guinea-Bissausemi-presidential republic
Guyanaparliamentary republic
Haitisemi-presidential republic
Holy See (Vatican City)ecclesiastical elective monarchy; self-described as an "absolute monarchy"
Honduraspresidential republic
Hong Kongpresidential limited democracy; a special administrative region of the People's Republic of China
Hungaryparliamentary republic
Icelandunitary parliamentary republic
Indiafederal parliamentary republic
Indonesiapresidential republic
Irantheocratic republic
Iraqfederal parliamentary republic
Irelandparliamentary republic
Israelparliamentary democracy
Italyparliamentary republic
Jamaicaparliamentary democracy (Parliament) under a constitutional monarchy; a Commonwealth realm
Japanparliamentary constitutional monarchy
Jerseyparliamentary democracy (Assembly of the States of Jersey)
Jordanparliamentary constitutional monarchy
Kazakhstanpresidential republic
Kenyapresidential republic
Kiribatipresidential republic
Korea, Northdictatorship, single-party state; official state ideology of "Juche" or "national self-reliance"
Korea, Southpresidential republic
Kosovoparliamentary republic
Kuwaitconstitutional monarchy (emirate)
Kyrgyzstanparliamentary republic
Laoscommunist state
Latviaparliamentary republic
Lebanonparliamentary republic
Lesothoparliamentary constitutional monarchy
Liberiapresidential republic
Libyain transition
Liechtensteinconstitutional monarchy
Lithuaniasemi-presidential republic
Luxembourgconstitutional monarchy
Macauexecutive-led limited democracy; a special administrative region of the People's Republic of China
Madagascarsemi-presidential republic
Malawipresidential republic
Malaysiafederal parliamentary constitutional monarchy

note: all Peninsular Malaysian states have hereditary rulers (commonly referred to as sultans) except Melaka (Malacca) and Pulau Pinang (Penang); those two states along with Sabah and Sarawak in East Malaysia have governors appointed by government; powers of state governments are limited by the federal constitution; under terms of federation, Sabah and Sarawak retain certain constitutional prerogatives (e.g., right to maintain their own immigration controls)
Maldivespresidential republic
Malisemi-presidential republic
Maltaparliamentary republic
Marshall Islandsmixed presidential-parliamentary system in free association with the US
Mauritaniapresidential republic
Mauritiusparliamentary republic
Mexicofederal presidential republic
Micronesia, Federated States offederal republic in free association with the US
Moldovaparliamentary republic
Monacoconstitutional monarchy
Mongoliasemi-presidential republic
Montenegroparliamentary republic
Montserratparliamentary democracy; self-governing overseas territory of the UK
Moroccoparliamentary constitutional monarchy
Mozambiquepresidential republic
Namibiapresidential republic
Nauruparliamentary republic
Nepalfederal parliamentary republic
Netherlandsparliamentary constitutional monarchy; part of the Kingdom of the Netherlands
New Caledoniaparliamentary democracy (Territorial Congress); an overseas collectivity of France
New Zealandparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Nicaraguapresidential republic
Nigersemi-presidential republic
Nigeriafederal presidential republic
Niueparliamentary democracy
Norfolk Islandnon-self-governing overseas territory of Australia; note - the Norfolk Island Regional Council, which began operations 1 July 2016, is responsible for planning and managing a variety of public services, including those funded by the Government of Australia
Northern Mariana Islandsrepublican form of government with separate executive, legislative, and judicial branches; a commonwealth in political union with and under the sovereignty of the US
Norwayparliamentary constitutional monarchy
Omanabsolute monarchy
Pakistanfederal parliamentary republic
Palaupresidential republic in free association with the US
Panamapresidential republic
Papua New Guineaparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Paraguaypresidential republic
Perupresidential republic
Philippinespresidential republic
Pitcairn Islandsparliamentary democracy
Polandparliamentary republic
Portugalsemi-presidential republic
Puerto Ricorepublican form of government with separate executive, legislative, and judicial branches; unincorporated organized territory of the US with local self-government

Note: reference Puerto Rican Federal Relations Act, 2 March 1917, as amended by Public Law 600, 3 July 1950
Qatarabsolute monarchy
Romaniasemi-presidential republic
Russiasemi-presidential federation
Rwandapresidential republic
Saint Barthelemyparliamentary democracy (Territorial Council); overseas collectivity of France
Saint Kitts and Nevisfederal parliamentary democracy under a constitutional monarchy; a Commonwealth realm
Saint Luciaparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Saint Martinparliamentary democracy (Territorial Council); overseas collectivity of France
Saint Pierre and Miquelonparliamentary democracy (Territorial Council); overseas collectivity of France
Saint Vincent and the Grenadinesparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Samoaparliamentary republic
San Marinoparliamentary republic
Sao Tome and Principesemi-presidential republic
Saudi Arabiaabsolute monarchy
Senegalpresidential republic
Serbiaparliamentary republic
Seychellespresidential republic
Sierra Leonepresidential republic
Singaporeparliamentary republic
Sint Maarten

parliamentary democracy under a constitutional monarchy

Slovakiaparliamentary republic
Sloveniaparliamentary republic
Solomon Islandsparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Somaliafederal parliamentary republic
South Africaparliamentary republic
South Sudanpresidential republic
Spainparliamentary constitutional monarchy
Sri Lankapresidential republic
Sudanpresidential republic
Surinamepresidential republic
Svalbardnon-self-governing territory of Norway
Swedenparliamentary constitutional monarchy
Switzerlandfederal republic (formally a confederation)
Syriapresidential republic; highly authoritarian regime
Taiwansemi-presidential republic
Tajikistanpresidential republic
Tanzaniapresidential republic
Thailandconstitutional monarchy
Togopresidential republic
Tokelau

parliamentary democracy under a constitutional monarchy

Tongaconstitutional monarchy
Trinidad and Tobagoparliamentary republic
Tunisiaparliamentary republic
Turkeypresidential republic
Turkmenistanpresidential republic; authoritarian
Turks and Caicos Islandsparliamentary democracy
Tuvaluparliamentary democracy under a constitutional monarchy; a Commonwealth realm
Ugandapresidential republic
Ukrainesemi-presidential republic
United Arab Emiratesfederation of monarchies
United Kingdomparliamentary constitutional monarchy; a Commonwealth realm
United Statesconstitutional federal republic
Uruguaypresidential republic
Uzbekistanpresidential republic; highly authoritarian
Vanuatuparliamentary republic
Venezuelafederal presidential republic
Vietnamcommunist state
Virgin Islandsrepublican form of government with separate executive, legislative, and judicial branches; unincorporated organized territory of the US with local self-government
Wallis and Futunaparliamentary democracy (Territorial Assembly); overseas collectivity of France
Yemenin transition
Zambiapresidential republic
Zimbabwepresidential republic

Source: CIA Factbook