Why did rome collapse?

The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders.

Explanation:

the answer is c. many americans held nativist or racist views

the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism