During the 1960s and 1970s, a significant cultural movement emerged in the United States that rebelled against traditional societal norms and values. This movement, often associated with young people, rejected mainstream culture, advocated for civil rights, opposed the Vietnam War, and embraced alternative lifestyles, fashion, and music. This era saw the rise of prevalent musical genres like rock 'n' roll, along with social movements that promoted peace, love, and communal living. Which of the following terms best describes this countercultural movement?