1994 – The league is split into three divisions.
1987 – Oakland A’s renamed Athletics.
1972 – Washington Senators move to Arlington, Texas, and become the Rangers.
1970 – Seattle Pilots move to Milwaukee and become the Brewers.
1969 – Kansas City Royals and Seattle Pilots join league as expansion teams. The league is split into two six team divisions.
1968 – Kansas City Athletics move to Oakland and become the A’s.
1965 – Los Angeles Angels renamed California Angels.
1961 – Washington Senators move to Bloomington, Minn., and become the Minnesota Twins. Los Angeles Angels and Washington Senators added as expansion teams, forming a 10-team league.
1955 – Philadelphia Athletics move to Kansas City.
1954 – St. Louis Browns move to Baltimore and become the Orioles.
1913 – New York Highlanders renamed Yankees.
1903 – Baltimore Orioles move to New York and become the Highlanders.
1902 – Milwaukee Brewers move to St. Louis and become the Browns.
1901 – American League is launched with eight charter members: Boston, Baltimore, Chicago, Cleveland, Detroit, Milwaukee, Philadelphia, and Washington.
Boston (Americans, Somersets, Red Sox), Chicago (White Sox), Cleveland (Blues, Naps, Indians), and Detroit (Tigers), are the only four franchises that remain from the originals and have never been moved.