In the earliest years, games were played around Washington, D.C., including on The Ellipse behind the White House.
Clark Griffith who then owned the Washington Senators (now Minnesota Twins) gave the league financial support.
In 1966 the league began playing all its game on the baseball field at George Mason University.
That continued until 1987 when teams began playing on their own home fields.
[3] The league instituted a rule requiring the use of only wooden bats in competition in 1993.