The term PART OF GSUSA is solved by the four-letter word GIRL. GIRL Scouts of the USA (GSUSA) is a youth organization for girls in the United States and American girls living abroad. It was founded in 1912 and is one of the largest organizations for girls in the world. The organization's mission is to build girls of courage, confidence, and character who make the world a better place. Girls in GSUSA participate in activities such as camping, community service, and leadership development.