It took so long for the Supreme Court to apply the Fourteenth Amendment to state authorities because of a deeply-embedded principle at the heart of the original Bill of Rights that it was state governments that needed protection from federal overreach.
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longer routes. new faster ships called caravels made longer voyages and therefore longer travel around the globe possible
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.
The problem with that the plaintiff had who's name was Oliver Brown was that his 8 year old daughter couldn't get into school because she was colored. So he went to court to have segregation put to an end in the public schools.