The major cause of shifts in political allegiance during this time came from the Great Depression, which required strong government intervention to correct the issue. These interventions became commonly ascociated with the Democratic Party, thanks to FDR.
This is a very complex question, but they both collapsed due to:
decentralization and government corruption
plagues/ epidemics
high taxes
and invasions
Some differences are that the Chinese empires saw a revival while Rome didn't.
Answer: THE EFFECT OF INVASIONS: BECAUSE
Population shifts- the population of Western Europe became more rural as Roman centers of trade collapsed. Nobles retreated to rural areas and the cities were left without strong leadership. Other city dwellers moved to rural areas to grow their own food.The fall of Rome also paved the way for another major part of Europe's history: feudalism. When Rome fell, Europe fell into a state of constant warfare. The new kings not only wanted to tax their populous, but also wanted them to fight during times of war.The western Empire spoke Latin and was Roman Catholic. ... In fact, after the western part of the Roman Empire fell, the eastern half continued to exist as the Byzantine Empire for hundreds of years. Therefore, the "fall of Rome" really refers only to the fall of the western half of the Empire.
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Explanation:
He sent soldiers to resupply the fort. The South wouldn't let them and eventually took control of it.