What caused the Chinese to send 300,000 troops to North Korea? A. The UN regained control of South Korea.

B. The UN troops pushed North Koreans to the Yalu River.

C. The UN voted to support South Korea in the conflict with North Korea.

D. The UN decided to place the troops under the command of Douglas MacArthur.

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.