A likely explanation would be that there was not enough food available for the entire growing civilization at the time, and that the people of the civilzation moved around and were eventually dissolved into different cultures,
Answer:
What costly mistake did the Confederate make before the Battle of Antietam? They divided their army. The Union army also found Lee's battle plan at an abandoned Confederate camp.
Explanation:
I believe there are lots of reasons why the Roman Empire declined but the 3 most important ones are, Government corruption and political instability, Invasions by Barbarian tribes, and The rise of the Eastern Empire, but the one I think is the most important is the first one reason.
