The Wilmot Proviso called for new states to allow slavery in the Southeast.
a ban on slavery in territories gained from Mexico.
new settlers to vote on slavery in the Southwest.
an extension the Missouri Compromise dividing line.

The answer is B.

Explanation:

According to Wikipedia, The Wilmot Proviso was an unsuccessful 1846 proposal in the United States Congress to ban slavery in territory acquired from Mexico in the Mexican–American War.

d)to gain support for the independence movement.

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