• Major League Baseball is comprised of the American League and National League

• 15 teams and three divisions in each league
• Divisions: Central, East, and West for each

• 25 players on the active roster per team
• National and American Leagues were dissolved as legal entities in 2000, and both were absorbed under the MLB organization.

National League

• Founded 1876
• World’s oldest current professional team sports league

American League

• Founded 1901
• Began as a minor league, unlike the National League

American League East

• Baltimore Orioles
• Boston Red Sox
• New York Yankees
• Tampa Bay Rays
• Toronto Blue Jays

American League Central

• Chicago White Sox
• Cleveland Indians
• Detroit Tigers
• Kansas City Royals
• Minnesota Twins

American League West

• Houston Astros
• Los Angeles Angels
• Oakland Athletics
• Seattle Mariners
• Texas Rangers

National League East

• Atlanta Braves
• Miami Marlins
• New York Mets
• Philadelphia Phillies
• Washington Nationals

National League Central

• Chicago Cubs
• Cincinnati Reds
• Milwaukee Brewers
• Pittsburgh Pirates
• St. Louis Cardinals

National League West

• Arizona Diamondbacks
• Colorado Rockies
• Los Angeles Dodgers
• San Diego Padres
• San Francisco Giants