World Border Changes: 1900s

Can you list every border change in the world in the 1900s?

Only includes sovereign states

Does not include unrecognized countries

Does not include separatist movements

Does not include dispute resolutions

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Last updated: January 16, 2021

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First submitted	January 16, 2021
Times taken	54
Average score	65.5%
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Year	Formerly	Became
1900	Samoa	United States
1900	Niue	United Kingdom
1901	Ashanti Empire	United Kingdom
1901	United Kingdom	Australia
1902	Mandara	Germany
1902	Abuja	United Kingdom
1902	Zaria	United Kingdom
1902	United States	Cuba
1903	Aceh	Netherlands
1903	Cuba	United States
1903	Adamawa	United Kingdom
1903	Adamawa	Germany
1903	Colombia	Panama
1903	Bolivia / Acre	Brazil
1903	Brazil	Bolivia

Year	Formerly	Became
1903	Panama	United States
1904	Champasak	France
1904	Siam	France
1904	France	Siam
1905	Norway-Sweden	Norway
1905	Norway-Sweden	Sweden
1905	Russia	Japan
1907	Siam	France
1907	France	Siam
1907	Colombia	Brazil
1907	United Kingdom	New Zealand
1908	Ottoman Empire	Bulgaria
1908	Congo Free State	Belgium
1909	Siam	United Kingdom