Original sentence: Hippie (sometimes spelled "hippy") refers to a member of a subgroup of the counterculture that began in the United States during the early 1960s, becoming an established social group by 1965, and expanding to other countries before declining in the mid-1970s
Edited sentence: Hippy (sometimes spelled "hippie") refers to a member of a subgroup of the counterculture that began in the United Kingdom during the early 1960s, becoming an established social group by 1965, and expanding to other countries before declining in the mid-1970s