How did the constitution fix the problems of the articles of confederation? use two of the following principles in a paragraph response: rule of law, checks and balances, separation of powers, republicanism, democracy, or federalism.

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: