Answer:
1990.
Explanation:
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It upset the balance of free and slave states in the US.
Answer:
A. He received an equal amount of electoral votes from both free states and slave states.
But received the majority from Northern FREE States
Explanation:
won a national popular plurality, a popular majority in the North where states already had abolished slavery, and a national electoral majority comprising only Northern electoral votes. Lincoln's election thus served as the main catalyst of the American Civil War.