Member states of the United Nations (UN), as defined by the UN.
Czechoslovakia during the interwar period and the Cold War
De facto map of control of the world, May 2019
Tomáš Garrigue Masaryk, founder and first president
Czechoslovak troops in Vladivostok (1918)
Czechoslovak declaration of independence rally in Prague on Wenceslas Square, 28 October 1918
A monument to Tomáš Garrigue Masaryk and Milan Štefánik—both key figures in early Czechoslovakia
Czechoslovakia in 1928
Linguistic map of Czechoslovakia in 1930
The partition of Czechoslovakia after Munich Agreement
The car in which Reinhard Heydrich was killed in 1942
Territory of the Second Czechoslovak Republic (1938–1939)
Socialist coat of arms in 1960–1989
Spartakiad in 1960
Czechoslovakia after 1969
The Visegrád Group signing ceremony in February 1991
Federal Assembly in Prague
Federative coat of arms in 1990–1992

Czechoslovakia, or Czecho-Slovakia ( Czech and Československo, Česko-Slovensko), was a sovereign state in Central Europe, created in October 1918, when it declared its independence from Austria-Hungary.

- Czechoslovakia

L.C. Green cited the recognition of the unborn Polish and Czechoslovak states in World War I and explained that "since recognition of statehood is a matter of discretion, it is open to any existing State to accept as a state any entity it wishes, regardless of the existence of territory or of an established government."

- Sovereign state

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Indigenous march right to self-determination (2008). Lumads from all over Mindanao march through the streets of Davao City at the end of a three-day conference.

Self-determination

Cardinal principle in modern international law , binding, as such, on the United Nations as authoritative interpretation of the Charter's norms.

Cardinal principle in modern international law , binding, as such, on the United Nations as authoritative interpretation of the Charter's norms.

Indigenous march right to self-determination (2008). Lumads from all over Mindanao march through the streets of Davao City at the end of a three-day conference.
Map of Ottoman Empire in 1683
Map of territorial changes in Europe after World War I (as of 1923)
Map of the world in 1945, showing United Nations Trusteeship Council territories in green
Western European colonial empires in Asia and Africa disintegrated after World War II
Changes in national boundaries after the end of the Cold War
Southern Sudanese expressed joy and jubilation on their day of independence, July 9, 2011, from Sudan.
Celebration of the Declaration of Independence of Kosovo in 2008
Donetsk status referendum organized by separatists in Ukraine. A line to enter a polling place, 11 May 2014
During the 2019-20 Hong Kong protests, calls rose for self-determination by Hongkongers.
The first major demonstration in Stepanakert on February 13, 1988. Traditionally considered the start of the Artsakh movement.
Tuareg rebels in the short-lived proto-state of Azawad in 2012
2014 human chain for Basque Country's right to decide
A girl during the Nigerian Civil War of the late 1960s. Pictures of the famine caused by Nigerian blockade garnered sympathy for the Biafrans worldwide.
Protest in Barcelona on 1 October 2018
Pro-Russian separatists in Donetsk, April 2015
Malvinas and South Atlantic Islands Museum in Buenos Aires, 2015
Gibraltar National Day, September 2013
Pro-independence Hong Kong flag put up before a football match between the Hong Kong Football Team and the China national football team
Indian soldiers on the streets of Kashmir during the 2016 unrests
Kurdish YPG's female fighters during the Syrian War
Pro-independence rally in Erbil, Iraqi Kurdistan in September 2017
Atatürk Square, North Nicosia in 2006, with the Northern Cyprus and Turkish flags.
A republican mural in Belfast showing support for Palestine
A Native American woman in traditional dress
Native Americans and their supporters protest during the Washington Redskins name controversy.
A demonstration in Madrid for the independence of Western Sahara, 2007

The end of the war led to the dissolution of the defeated Austro-Hungarian Empire and Czechoslovakia and the union of the State of Slovenes, Croats and Serbs and the Kingdom of Serbia as new states out of the wreckage of the Habsburg empire.

Most sovereign states do not recognize the right to self-determination through secession in their constitutions.