Which of the following was a key challenge facing the new nation? A. Powerful central government B. The lack of desire for diversity C. Weak state governments D. The lack of desire for unity

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

these acts divided the south into five military districts.

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:

no one really purchased it themselves, it was all america, they had debates etc.