1.

Popular Soverignty
Henry Clay's proposal meant to keep the number of slave states and free states equal.
Free-Soil Party
A failed law meant to ban slavery in areas won during the Mexican-American War.
Wilmot Proviso
The idea that the people have the right to create their government.
Missouri Compromise
Founded in Buffalo, the main goal was to keep slavery out of the western territories.

These are all statements related to different events and concepts in American history. What is your question about them?