Answer:
A A Declining economy
Explanation:
There poor economic policies led to a weakend military which allowed barbarians easy access to the empire.
The transition from gather and hunting, and nomadic behavior to settling in on place and starting agriculture
It was primarily the "Reconstruction Act" that forced states to accept the Fourteenth Amendment in order to join the Union, since this led to a military oversight of the Southern states immediately after the Civil War.
The Bay of Pigs Invasion in 1961
Because they were being taxed without having any representation in the government
