a. henry clay's proposal meant to keep the number of slaves states and free states equal
b. a failed law meant to ban slavery in areas won during the Mexican-American War.
c. the idea that the people have the right to create their government.
d. founded in Buffalo, the main goal was to keep slavery out of the western territories.
The correct answer is c. Popular sovereignty refers to the idea that the people have the right to create their government, usually through voting or other participation in the political process. This concept played a central role in debates over slavery and expansion in the mid-19th century, as many people believed that the settlers in the western territories should be able to decide for themselves whether to allow or prohibit slavery in their new states.
