Adolf Hitler and Benito Mussolini were fascist leaders that came to prominence by harnessing the power of

Ethnic Nationalism

Explanation:

ethnic nationalism.

Explanation:

To Hitler and Mussolini respectively, Germany and Italy were nations defined by people that shared the same race and ethnicity. Anyone who did not fit that archetype did not “count” as truly German or Italian.

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.