The Beltway Series, promoted by the teams as The Battle of the Beltways, is the Major League Baseball (MLB) interleague rivalry series played between the Baltimore Orioles and Washington Nationals. The Orioles are a member of the American League (AL) East division, and the Nationals are a member of the National League (NL) East division. The series name is taken from the two beltway highways, the Baltimore Beltway and the Capital Beltway, that service Baltimore and Washington, D.C. The relocation of the Montreal Expos to Washington in 2005 marked the first time the Baltimore–Washington Metropolitan Area had two Major League Baseball franchises since 1971, when the second Washington Senators franchise moved to Texas to become the Texas Rangers.