Why were Southern whites concerned when Abraham Lincoln was elected in
1860?

Abraham Lincoln is elected to 16th president of the United States over a deeply 40% of the popular vote but handily defeated the three other candidates in 1860 Lincoln's won the party's presidential nomination and it had been publicly threatening secession if the Republicans gained the White House.

Explanation:

The whites were afraid that Lincoln would abolish slavery, resulting in the economic collapse of the South which heavily relied on slavery and agriculture.

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