After World War I, the United States had adopted a policy of isolationism, where they would not participate in global warfare or officially join the League of Nations. Roosevelt delivered the Four Freedoms speech 11 months before the United States declared war on Japan. The Four Freedoms speech was a break from the previous period of anti-interventionism, and described how the United States would be willing and able to assist its allies already at war.
Necessary and Proper clause – Congress has the power to make laws necessary and proper to enact enumerated powers. The states had more power than the national/central/federal government. Federalism – The US Constitution divides power between the Federal/National government and state governments.
"<span>Many young people rebelled against their parents' politics and values" is by far the best choice since many in the movement were against the war and very liberal. </span>