Why were the states wary of establishing a central form of government? (Back when articles of confederation where still a thing)

What was the purpose of the federal reserve act

Name three new weapons that changed how ww! was fought and how?

How did slavery end in the united statesa. it ended with the emancipation proclamationb. it ended when the union won the civil warc. it ended with the fifteenth amendmentd. it ended with the 13th amendment