The french helped tremendously with the american independence movement. They were still very bitter about the loss of the french and Indian war, and jumped at the opportunity to help defeat the British. After the war ended, France had its own revolution, which was inspired by and based off the american war for independence. A few american figures even helped out with the french revolution.
NAZI party members were not imprisoned in concentration camps , as long as they didn't mess up :)
The principle of Federalism is most reflected in the US Government & the Constitution's limits on the Federal Government's powers and the reservation of powers for the States. This is set forth clearly in the 10th amendment.
Federalism is evident throughout Government. An example of the US Department of Education. Education is a power reserved to the States and so the US Department of Education funds projects and ensures equity but the power to set curriculums is done by the States.