Where did the biggest riot occur during the civil war?

the biggest recorded was the new york city drafts.

Explanation:

The New York City draft riots (July 13–16, 1863), known at the time as Draft Week, were violent disturbances in Lower Manhattan, widely regarded as the culmination of white working-class discontent with new laws passed by Congress that year to draft men to fight in the ongoing American Civil War.

Date: July 13, 1863 – July 16, 1863

Resulted in: Riots ultimately suppressed

Location: Manhattan, New York, U.S

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explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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