Major League Baseball (MLB) is a professional baseball league and the highest level of organized baseball in the United States and Canada. One of the "Big Four" major professional sports leagues in the United States and Canada, MLB comprises 30 teams, divided equally between the National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. Formed in 1876 and 1901, respectively, the NL and AL cemented their cooperation with the National Agreement in 1903, making MLB the oldest major professional sports league in the world.
https://en.wikipedia.org/wiki/Major_League_Baseball