What event that helped create the counterculture?

The Vietnam War was what really started the hippie movement in the 60's and 70's. People were tired of being in a war that couldn't be won, and many, mostly young students on campuses, started to protest against the war. One example is Woodstock, in 1969, or the protests against Nixon's secret bombing of Cambodia at Kent and Jackson State Universities. "Hippies" are most known for their "Make love, not war" philosophy. The counterculture was also a mix of sexual revolution and drug experimenting, like LSD.