Which of the follwoing BEST explains why the decision made in Dred Scott v. Sanford nullified the Compromise of 1850 and popular sovereignty? A.
It defined slaves as property that could not be legally taken by the government

B.
It granted the Supreme Court the power to abolish slavery and denied it to Congress

C.
It granted states the right to secede if the federal government violated the Constitution

D.
It held that African-Americans could not be citizens and therefore could not vote