How did satellites impact scientific understanding of space during the late 20th century?

He u. s. constitution (1787) establishes a national legislature with powers to “create national law”, a national executive with the power to “enforce national law”, and a national judiciary branch with the power to “interpret national and state policies” to see whether or not they violate the national constitution. this term describes the division of governmental authority into semi-independent bodies?

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

In one to two paragraphs, compare and contrast the american, french, and mexican revolution.