Which igneous American civilization declined mainly due to chronic drought conditions

The Mayan civilization is one of the oldest civilizations in America. The reason behind its sudden collapse can be estimated to be the sudden drought and environmental condition.

Explanation:

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in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

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