What date was the constitution approved by the states?

What was a major failing of the united states government under the articles of confederation?

Two of these describe "federalism." (choose two answers) select one or more: a. the national government absolutely controls all state governments. b. power is shared by the national and state governments. c. state governments exercise absolute power over the national government. d. it is a compromise meant to eliminate the disadvantages of a "unitary" and a "confederate" system.

Where did the first african american fighter pilots begin training?