Identifying Events of the Counterculture Movement

During the 1960s and 1970s, a significant cultural movement known as the counterculture emerged in the United States. This movement was characterized by a rejection of the traditional values of mainstream society, particularly in relation to politics, materialism, and social norms. Prominent among the features of the counterculture were the use of psychedelic drugs, a fascination with Eastern religions, anti-establishment sentiments, and a strong emphasis on peace and love, especially as a response to the Vietnam War.

Which of the following events or phenomena is most closely associated with the counterculture movement of this period?