The historical time line primarily consists of the period between 1957 and 1973 that began in the United States as a reaction against the conservative government, social norms of the 1950s, the perceived social repression) of the Cold War period, segregation and discrimination against African Americans, and the US Government's extensive military intervention in Vietnam.
As the 1960s progressed, widespread tensions developed in American society that tended to flow along generational lines regarding the Vietnam War, race relations, sexual mores, women's rights, traditional modes of authority, experimentation with psychedelic drugs and an interpretation of the American Dream based predominantly on consumerism. New cultural forms emerged, including the pop music of English band the Beatles, which rapidly evolved to shape and reflect the youth culture's emphasis on change and experimentation.
