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Some countries and empires could have had much more territory than they actually had.

With a PoD before 1900, what could be the largest possible extent of the following empires, and if possible, have them survive till modern day:

Napoleonic France
Roman Empire
Qing Dynasty
Majapahit
Mauryan Empire
United States
Mexico
Gran Colombia
Argentina
Greece
Russian Empire
British Empire (lol)
Spanish and Portuguese Empires
Byzantine Empire (Rome excluded)
Republic of Venice
Polish-Lithuanian Commonwealth
German Empire/Holy Roman Empire
Any Scandinavian union
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