alternatehistory.com

Your challenge is simple. Have, at any one point:
1) All land on Earth be effectively controlled by any 1 sovereign entity.

Apart from the sovereign entity being made out of humans (specifically, Homo Sapiens) and not cleverly redefining Earth as a separate planet, there are no other limits. Go wild!

Just to clarify, it's acceptable if control is achieved post 1900.
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