Question

PLEEEEAAAASE HEELLLLLPPP

Answer 1

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.