World Border Changes: 1910s

Can you list every border change in the world in the 1901s?

Only sovereign states

No unrecognized countries or separatist movements

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Last updated: January 16, 2021

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First submitted	January 16, 2021
Times taken	38
Average score	67.7%
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Year	Formerly	Became
1910	Kasanje	Portugal
1910	Mexico	United States
1910	United States	Mexico
1910	United Kingdom	South Africa
1910	Korea	Japan
1911	France	Germany
1911	Qing China	Mongolia
1912	Wadai	France
1912	Qing China	China
1912	Mexico	United States
1912	United States	Mexico
1912	France	Spain
1912	Ottoman Empire	Albania
1913	China	Tibet
1913	Ottoman Empire	Bulgaria
1913	Bulgaria	Romania
1913	Ottoman Empire	Serbia
1913	Ottoman Empire	Greece
1913	Ottoman Empire	Albania
1913	Austria-Hungary	Montenegro
1913	Bulgaria	Ottoman Empire
1913	Ottoman Empire	Bulgaria
1915	United States	Panama
1915	Panama	United States
1917	Denmark	United States
1917	Russia	Chechenia
1917	Russia	Finland
1918	Russia	Lithuania
1918	Russia	Estonia
1918	Russia	Transcaucasian Federation
1918	Transcaucasian Federation	Georgia
1918	Transcaucasian Federation	Armenia
1918	Transcaucasian Federation	Azerbaijan

Year	Formerly	Became
1918	Panama	United States
1918	Austria-Hungary	Kingdom of Slovenes, Croats, and Serbs
1918	Ottoman Empire	North Yemen
1918	Austria-Hungary	Austria
1918	Russia	Poland
1918	Russia	Latvia
1918	Montenegro	Serbia
1918	Austria-Hungary	Romania
1918	Serbia	Kingdom of Serbs, Croats, and Slovenes
1918	Denmark	Iceland
1919	Austria-Hungary	Hungary
1919	Lithuania	Poland
1919	Germany	France
1919	Germany	United Kingdom
1919	Germany	Portugal
1919	Germany	Japan
1919	Germany	New Zealand
1919	Germany	South Africa
1919	Germany	Australia
1919	Germany	Belgium
1919	Germany	Poland
1919	Germany	Danzig
1919	United Kingdom	Afghanistan
1919	Austria-Hungary	Poland
1919	Austria-Hungary	Italy
1919	Austria-Hungary	Romania
1919	Austria-Hungary	Czechoslovakia
1919	France	Italy
1919	Panama	United States
1919	Bulgaria	Greece
1919	Bulgaria	Kingdom of Serbs, Croats, and Slovenes
1919	Bulgaria	Romania