Put in order 1-3 please

richard nixon led the investigation that resulted in alger hiss being convicted of prejury.

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.

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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.