How has federalism changed or evolved over time.

Federalism has evolved over the course of American history. ... Because the powers rarely overlapped, dual federalism is also known as 'layer cake' federalism. Dual federalism was used in this country for a long time. However, by the 1930s, 'layer cake' federalism began to morph into 'marble cake' federalism.

answer: in october 1962, an american u-2 spy plane secretly photographed nuclear missile sites being built by the soviet union on the island of cuba. president kennedy did not want the soviet union and cuba to know that he had discovered the missiles. he met in secret with his advisors for several days to discuss the problem.

explanation:

he sent troops to protect the students as they entered the school.