What did the Missouri Compromise, the Compromise of 1850, and the Kansas-Nebraska Act have in common?

A.
They provided for the gradual emancipation of slaves in new territories

B.
They were popular among abolitionists and led to the election of Lincoln in 1860

C.
They all tried to solve sectional differences that were made worse by western expansion

D.
They were all vetoed by President Lincoln after the secession of the Confederate States