1. Woodrow Wilson
2. William Howard Taft
3. Theodore Roosevelt
I think these may be the answers.
Labor was a problem in the southern colonies because slavery was free labor so the south became dependent on slavery to be successful.
'<span>In 1830 representatives from </span>Georgia<span> and the other southern states pushed through Congress the Indian Removal Act, which gave U.S. president </span>Andrew Jackson<span> the authority to negotiate removal treaties with the Native American tribes.'</span>
One of the main factors that contributed to the downfall of both the Inca and Aztec empires was their lack of natural immunity to diseases that the Spanish brought with them from Europe.
Slaveholders wanted to expand slavery west, and conflict broke out between anti-slavery and pro-slavery Americans in Kansas I.E Bloody Kansas.
2. Because it set the precedent through the Supreme Court that blacks whether free or still in slavery were not citizens and were considered property (if slaves), therefore could not sue in court. The north was primarily against slavery whereas the South was pro-slavery.