The Constitution was designed to limit the power of government while ensuring basic personal rights for American citizens. The new government would be based on democratic principles. These principles placed the emphasis on the good of the people, allowing their participation while protecting their individual rights.
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.