Major League Baseball is the youngest of the four major professional sports leagues in the United States and Canada.
=== Relocation and expansion ===From 1903 to 1953, the major leagues consisted of two eight-team leagues whose 16 teams were located in ten cities, all in the northeastern and midwestern United States: New York City had three teams and Boston, Chicago, Philadelphia, and St
 For professional baseball's founding year, MLB uses the year 1869when the first professional team, the Cincinnati Red Stockings, was established

