How did the missouri compromise affect the spread of slavery?

a. it declared that the popular vote in each state would decide the question of slavery.

b. it created a balance between slave states in the south and free states in the west.

c. it drew a line through western territories to determine future free and slave states.

d. it declared that congress could make a recommendation for admitting a state.

C. It drew a line through western territories to determine future free and slave states

Explanation:

The Missouri Compromise was an act that threatened to disturb the fragile balance between the slave states and the free states. The tensions were constantly growing between the two opposing sides, and on top of it, Missouri decided to want slavery to be officially allowed in its borders. This rose the tensions, but still the situation didn't escalated. The balance was kept through negotiations, and the free states balance things with declaring Maine as territory were the slavery is forbidden. Imaginary borders were made in the western territories as well, as lines that separate the free and the slave territories.

It drew a line through western territories to determine future free and slave states

Explanation:

d.

the northwest territory became the most densely populated area in the u.s.