AHC and Plausibility Check: have one country own half of the world's territory.

Is this one even possible? Or would such a country go down in internal struggles before it would reach such a size?

And which countries would be able to grow this large?
 
A British Empire that keeps the Thirteenth Colonies and proves very very lucky afterwards may have a decent chance a growing really, really big.
India+Australia+most of North America+a major chunk of Africa+maybe a good part of La Plata+a bunch of other assorted stuff all over the map should be fairly close to the mark. They'd have a godawful lot of major issues of all kinds though.
 
The Mongols only were a few tenths of a percent smaller than the largest extent of British at their height.

Now, what of the remainder would have been a plausible conquest for them, I don't know (since we probably wouldn't have them in the Americas).
 
-Britain keeps the 13 colonies
-British North America still expands all the way to the Pacific, reaching a size a little larger than the OTL US+Canada combined
-Britain takes Indonesia from the Dutch in the early 19th century
-A different version of the Scramble for Africa happens, with Britain and France taking the lion's share.
-Some kind of massive global war goes down in the 20th century (Britain and somebody else vs. France and Russia). Russia is completely obliterated, and Britain takes all of Siberia. Britain takes all of France's colonies too, then goes ahead and claims all of Antarctica and the Arctic.

Final size of the British Empire: OTL+nearly all of Africa+South and Southeast Asia+USA+Siberia+Antarctica+the Arctic.

That has to be pretty close to 1/2 of the world's territory.
 
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