Final answer:
The fall of the Roman Empire was caused by the Empire's focus on the eastern half, political and social issues, and external threats like the Persian Empire and Germanic tribes.
Step-by-step explanation:
The fall of the Roman Empire had multiple causes. One major cause was the shifting of the Empire's resources to the eastern half, which left the western half vulnerable to invasions from Germanic tribes. The decline of Rome was also a result of political and social issues, including corruption, weak leadership, and a decline in Roman values. The clash between paganism and Christianity, as well as constant wars with external threats like the Persian empire and Germanic tribes, also contributed to Rome's decline.