The counterculture movement began in the late 1950s and early 1960s as a reaction against the conservative 1950s and the threat of nuclear war. Led by the Beat Generation in New York and San Francisco, the counterculture rejected materialism and experimented with jazz, drugs, sex, and Eastern religions through literary works like Howl by Allen Ginsberg and On the Road by Jack Kerouac. The movement influenced psychedelic art and music in the 1960s, with LSD being promoted by figures like Timothy Leary before being made illegal in 1966. By the late 1960s, the counterculture had grown to include rock music and anti-war protests, but began to decline with drug overdoses and