American federalism is the constitutional relationship between U.S. state governments and the Federal government of the United States. Since the founding of the country, and particularly with the end of the American Civil War, power shifted away from the states and towards the national government.
The causes of the Economic Boom of the 1920s were the Republican government's policies of Isolationism and Protectionism, the Mellon Plan, the Assembly line and the mass production of consumer goods such as the Ford Model T Automobile and luxury labor saving devices and access to easy credit on installment plans.
The movement of enslaved Africans to America became known as The Middle Passage.
Answer:
I would assume it is the Great Depression
