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.
ANSWER:
<span>The Cyrillic alphabet, developed by two proselytizing monks, Cyril and Methodius.
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Answer:
The Republican Party, often called the GOP (short for “Grand Old Party”) is one of two major political parties in the United States.
Explanation:
They experienced floods and droughtt so they couldn't grow crops