In order to maintain the two great political parties as vital bonds of national unity, party leaders in the late 1840's
a. called for the banning of slavery from all us territories
b. called for allowing slavery into all the us territories
c. avoided a full public discussion of and debate about slavery
d. banished abolitionists from membership in either national party

The correct answer is letter C

Explanation: Avoided public discussion of and debate about slavery

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.