Which of these led to more slavery?
a. the 12th amendment
b. the mccormick reaper
c. high tariffs
d. the cotton gin

If I remember it correctly, D. the cotton gin led to more slavery as one of the surge in production required more slaves to get the cotton.

First, few Europeans considered Native Americans to be their equals, because of differences in religion, agricultural practice, housing, dress, and other characteristics, Europeans considered Native Americans to be inferior. Secondly, Europeans were confused when Native Americans continued to use land that they thought they had purchased to own forever. Native Americans also tended to have a more communal approach to property and trade. This eventually lead to the colonization that ruptured many ecosystems, bringing in new organisms while eliminating others. The Europeans brought many diseases with them, which decimated Native American populations.