Why did the us government think interment camps were necessary for world war 2

What is the term for a short statement about history that has not been yet been proved

How did the atomic bomb end the war

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.