In the 1920s many people in the us favored a policy of to keep the nation with other nations

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in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else