Answer:
about 3/4th of the population
Cromagnons had better tools which made them better hunters, and they painted on cave walls
First the act proclaimed 'that all persons born in the USA are hereby declared citizens. Second the act specifically defines the rights of American citizenship. Third the act made it unlawful to deprive a person of any of these rights of citizenship on the basis of race color or prior condition of slavery or involuntary servitude.
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.
