Which of the following doubled the size of the United States in 1803? A. the Civil War
B. the Louisiana Purchase
C. the American Revolution
D. the Mexican-American War

How does federalism limit the power of government in the united states? a. it requires the national government to share power with state governments. b. it ensures that one state cannot make laws that affect all the other states. c. it requires the three branches of the national government to share powers. d. it allows the judicial branch to rule on laws that affect the entire country.