Final answer:
Hippies were the Americans who participated in the counterculture movement of the 1960s, advocating for social change and embracing non-traditional values.
Explanation:
Americans who participated in the counterculture were known as hippies. In the 1960s, the counterculture movement emerged in the United States, characterized by a rejection of traditional social norms and values. The hippies advocated for ideals such as free speech, equality, and peace, while opposing the Vietnam War and societal injustices.
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