Major League Baseball - Wikipedia
en.wikipedia.org › wiki › Major_League_BaseballMLB.com. Major League Baseball ( MLB) is a professional baseball organization and the oldest major professional sports league in the world. [B] MLB is composed of 30 total teams, divided equally between the National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. The NL and AL were formed in 1876 and 1901 ...