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.
It would be the "Ninth Amendment" that states that the rights in the U.S. Constitution are not the only rights that citizens possess, since the Founders wanted many rights to be reserved for the people and the states.
According to George Washington the nation would have split up if it stayed a confederation.
it was a desert island me and my friends were playing around and all of the sudden this guy came up to us asked if we need help we told him not and he came up at us and hit us