<human>:  Why did the anti-war movement start?
<bot>: The anti-war movement started in the 1960s as a protest against the Vietnam War. It grew into a larger social movement that spread throughout the world. The anti-war movement is often associated with the civil rights movement, and the women's liberation movement. It was also influenced by the counterculture of the 1960s, which included the hippie movement, and the peace movement.