Which issue was central to the conflict between the North and the South durning the decades leading up to the Civil War? A. Political Party Divisions
B. States’ rights
C. Foreign intervention
D. Territorial Expansion

B. States’ rights

Explanation:

South demanded nullification of right of slaves whereas North opposed it so they fought for these ideas under the "States' rights" because it dealt with how each state wanted things to be done (most times in their own way)

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.