The Boy Scouts of America (BSA, colloquially the Boy Scouts) is the largest scouting organization and one of the largest youth organizations in the United States, with about 2.3 million youth participants and about one million adult volunteers. The BSA was founded in 1910, and since then, about 110 million Americans participated in BSA programs at some time in their lives. BSA is part of the international Scout Movement and became a founding member organization of the World Organization of the Scout Movement in 1922.