What was significant about the free soil party and the fact that slavery was a political issue for the first time?

The free soil party was created to oppose slavery.

Explanation:

The free soil party was created to oppose slavery and the fact that slavery was an election issue proved that it had become a divisive issue in the US. ... The entrance of Missouri to the union as a slave state would give the south majority in the senate, tipping the balance of power in favor of slavery.

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