Because they ate each other?
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The president, at that date, was John F. Kennedy.
Answer: Outside Invaders Threatened Border Areas
Explanation: There were string of military losses sustained against the Germanic Tribes. Rome has been at constant war with the Germanic Tribes for centuries and by 300 AD, a Tribal group called the Goths had encroached the borders of the Roman Empire. In the year 410, Visigoth King Alaric sacked the city of Rome. Then the Vandals tribe sacked Rome in 455 as well. It was in 476, when the Germanic Leader Odoacer staged a revolt and deposed of the Emperor Romulus Augustulus. It is at this moment that Western Rome falls and the Medieval Age begins as Europe falls into a dark age.
The best option from the list would be that "<span>B. economic and political problems in France," </span>sparked the French Revolution, since many people were upset with the vast amount of inequality that existed in the state due to a despotic king, although the American Revolution was hugely influential.