What important balance did the Missouri Compromise maintain? The number of free states and slave states

The equal balance of trade between the North and the South

The equal populations of the North and the South

The number of enslaved persons and free people

Primarily, in theory, the number of free states and slave states.

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.