Most members of the free-soil party opposed the spread of slavery because they believed

a) allowing slavery to expand would make it difficult for free men to find work.

b) allowing slavery to expand would shift political power to the south.

c) slavery was immortal and would be abolished.

d) the people of the western territories should decide about slavery.

pls give explanation

A. Allowing slavery to expand would make it difficult for free men to find work.

Explanation:

Slaves were bought and worked for free with many different jobs, which the members of the Free-Soil Party thought would make it harder for free men to find work. Plantation and factory owners would rather have someone work for free than for money, so they would pick having slaves than over paying regular men.

porter is writing economic history because he is focusing on the cost of developing vaccines.

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.