United Soccer League was created in 1984.
United Soccer League of Pennsylvania was created in 1959.
Japan Soccer League ended in 1992.
International Soccer League ended in 1965.
Xtreme Soccer League ended in 2009.
Major League Soccer, or MLS, is the largest professional soccer league in the United States.
The MLS is the professional league in the United States and it stands for Major League Soccer.
World Indoor Soccer League ended in 2001.
Continental Indoor Soccer League ended in 1997.
"D.C. United is an American professional soccer club based in Washington, D.C. which competes in Major League Soccer (MLS), the top professional soccer league in the United States and Canada."
Women's United Soccer Association ended in 2003.
Major League Soccer is the name of the United States' highest-level soccer league. Canada also participates in this league. It was founded in December 1993 and currently includes 19 teams.