What Major League Baseball teams were established in the 1950's?

There were no new MLB franchises created in the 1950s. However, the Boston Braves moved to Milwaukee in 1953, the St. Louis Browns moved to Baltimore and became the Orioles in 1954, the Philadelphia Athletics moved to Kansas City in 1955, the Brooklyn Dodgers moved to Los Angeles in 1958, and the New York Giants moved to San Francisco in 1958.