Please help with both questions

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.

Plz me asap! and plz put a real answer! which of the following best describes richard russell's contribution to the war effort? by serving on the senate's naval affairs committee, he investigators learn how the pearl harbor attack was carried out. by to establish military bases like georgia's fort benning, he the state become an important resource to the federal government. by traveling to the war's regions, he develop maps of europe and the pacific. by working with his state's shipyards, he was able to obtain federal contracts to supply the military with ships built in savannah and brunswick.

What are the most populous and least areas of russia and why are some areas more heavily populated than others