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How large could the following empires, which were some of the largest empires the world has ever seen, even in OTL, conceivably have gotten? (Not all in the same TL, just hypothetically. And you don't have to answer all of them.)

The Ottoman Empire

The Mongol Empire

The Caliphate (any of them)

The Timurid Empire

The Eastern Roman Empire

The British Empire

The Spanish Empire

The Russian Empire (or the USSR)

United States of America

Mexican Empire

Or the Roman Empire, but that's been talked about so much and people get really fierce about it.
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