The region of terror occurred during the French Revolution because foreign countries started attacking France and the civil war caused the condition to worsen. It went for so long because of the civil war.
The French Revolution began with the countries attacking France due to its weak government.
The war occurred for a long time because the slaves fled and started living in camps which further led to the vulnerability of the country. The citizens of the country became enraged and started to fight with the government. The anger of the citizens caused a reign of terror to occur which continued for a long time.
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