These maps depict the consequences of the Two World Wars: the rise communism states, the end of European colonial empires, and the Cold War.
Rival military coalitions in Europe 1914
Source: https://en.wikipedia.org/wiki/World_War_I
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World empires and colonies around 1914
Source: https://en.wikipedia.org/wiki/World_War_I
____________________________________________________________________________________________________________________ Map of territorial changes in Europe after World War I (1923)
Source: https://en.wikipedia.org/wiki/World_War_I
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Colonial Empires at the End of World War II
Source: https://en.wikipedia.org/wiki/Colonialism
____________________________________________________________________________________________________________________ Western colonial empires in Asia and Africa all collapsed in the years after 1945
Source: https://en.wikipedia.org/wiki/Cold_War
____________________________________________________________________________________________________________________ Post-war border changes in Central Europe an the creation of the Eastern Bloc
Sources: https://en.wikipedia.org/wiki/World_War_II
____________________________________________________________________________________________________________________ Changes in national boundaries after the end of the Cold War and the post-Soviet States
Source: https://en.wikipedia.org/wiki/Cold_War