As of 2015, there are 30 Major League Baseball teams. Fifteen teams are in the National League, while the American League also has 15 teams. The majority of cities or regions have only one team, but some cities like New York, Chicago and the greater Los Angeles area have two teams.
The history of Major League Baseball dates back to 1876 when the National league was formed by William Hulbert. The American League was formed in 1901. The first World Series occurred in 1903. However, the first baseball game in the United States was played in 1846 in Hoboken, N.J.
Within each league are geographically aligned East, Central and West Divisions comprised of five teams each. The three division winners clinch postseason berths, while the fourth- and fifth-best AL and NL teams compete in a one-game playoff to determine who plays the division champion with the best overall record in the next round, the best-of-five Division Series. The two Division Series winners in each league then compete in the best-of-seven Championship Series, with the winner advancing to the World Series.