The transfer of power from the central government to state or local government is called "devolution," since this would be the opposite of a smaller power "evolving" into a larger one.
D) To fight the spread of communism.
Because of the Domino Theory they thought that if Vietnam fell into Communism, the whole region would follow. So therefore they wanted to support South Vietnam in order to contain Communism in Asia.
South America can be divided into three physical regions: mountains and highlands, river basins, and coastal plains. Mountains and coastal plains generally run in a north-south direction, while highlands and river basins generally run in an east-west direction.
To be a teenager now-a-days, you have to know all of the "Trends" you have to be on every "Social media" you have to be "popular" to be accepted, Things are way different then it was before our time.