Answer:
World War II. This event marked the end of American isolationism and neutralism and the beginning of foreign and defense policy of intense internationalism. ... The U.S. economy was the only major economy that came out of WW II intact. This made the country an instant economic superpower.
<span>The Adams–Onís Treaty of 1819, also known as the Transcontinental Treaty, the Florida Purchase Treaty, or theFlorida Treaty, was a treaty between the United States and Spainin 1819 that ceded Florida to the U.S. and defined the boundary between the U.S. and New Spain.</span>
The answer is Marshall Plan
Generally speaking, in the United States, conformity and the consumer culture of the 1950s were both supported by "economic prosperity," since for the first time in a while, people had the means to purchase luxury goods. <span />
Because the policy of segregation practiced in the south.