Major League Baseball (MLB) is a professional baseball organization and the oldest major professional sports league in the world. 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, respectively. Beginning in 1903, the two leagues signed the National Agreement and cooperated but remained legally separate entities until 2000, when they merged into a single organization led by the Commissioner of Baseball.
Arizona Diamondbacks 
Atlanta Braves 
Baltimore Orioles 
Boston Red Sox 
Chicago Cubs 
Chicago White Sox 
Cincinnati Reds 
Cleveland Guardians 
Colorado Rockies 
Detroit Tigers 
Houston Astros 
Kansas City Royals 
Los Angeles Angels 
Los Angeles Dodgers 
Miami Marlins 
Milwaukee Brewers 
Minnesota Twins 
New York Mets 
New York Yankees 
Oakland Athletics 
Philadelphia Phillies 
Pittsburgh Pirates 
San Diego Padres 
San Francisco Giants 
Seattle Mariners 
St. Louis Cardinals 
Tampa Bay Rays 
Texas Ranger 
Toronto Blue Jays 
Washington Nationals