Question

How did the Roman empire decline?

Answer 1

Answer:

Invasions by Barbarian tribes. 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.

Answer 2

Rome didn’t fall in 476 when Romulus, the last of the Roman emperors in the west, was overthrown by the Germanic leader Odoacer, who became the first Barbarian to rule in Rome.

Nor did it fall in 1453 when the Ottoman Empire conquered Constantinople.