The US lost the most amount of men in the US Civil War, because the US was fighting itself. US citizens fought US citizens.
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Britain
he won 46 wars in his life
Maybe Italy. They haven't won a war in 2,000 years, which some say is the reason for their survival.
Over a series of wars, most of which it won, Sparta lost most of their military manpower, and could no longer compete with the rising power of Thebes.
they won 16