The 1960s counterculture and social movements shook up American society. Young people challenged traditional values, experimenting with new lifestyles, music, and drugs. This era saw the rise of hippies, psychedelic culture, and protests against the Vietnam War and racial injustice. Key figures like Timothy Leary and groups like the Black Panthers pushed for radical change. The counterculture left a lasting impact on American society, influencing everything from fashion and music to attitudes about gender roles and environmentalism. However, it also faced criticism for excess and ineffectiveness.