<span> Before becoming president, he served in distinguished legal, military and congressional posts, and was governor of Ohio.
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Virginia, Alabama, Georgia, and other states with big cash crop plantations had the largest slave population in 1860.
This is a very complex question, but they both collapsed due to:
decentralization and government corruption
plagues/ epidemics
high taxes
and invasions
Some differences are that the Chinese empires saw a revival while Rome didn't.
FBI, Border Patrol, CIA, Homeland Security
By creating Habeas Corpus which gave everyone more rights and a little more social freedom.
