For the United States, 1945–1964 was a time of high economic growth and general prosperity. It was also a time of confrontation as the capitalist United States and its allies politically opposed the Soviet Union and other communist states; the Cold War had begun. African Americans united and organized, and a triumph of the civil rights movement ended Jim Crow segregation in the Southern United States. Further laws were passed that made discrimination illegal and provided federal oversight to guarantee voting rights.