Answer:
The terrorists flew planes into the Pentagon and World Trade
Roman Empire
The Fall of the Western Roman Empire (also called Fall of the Roman Empire or Fall of Rome) was the process of decline in the Western Roman Empire in which the Empire failed to enforce its rule, and its vast territory was divided into several successor polities.
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
African-American citizens made up a full three-quarters of regular bus riders, causing the boycott to have a strong economic impact on the public transportation system and on the city of Montgomery as a whole.
