Major League Baseball is the oldest major professional sports league in the world. Major League Baseball is composed of 30 teams, divided equally between the National League and the American League.
The Negro National League I was the first of two iterations of the NNL. The NNLI was founded by player/manager, Rube Foster, installing himself as League President and Commissioner.
The Negro Southern League (NSL) was a professional baseball league organized as a minor league for player development in service to the Negro National League I in 1920 and lasted until 1936.
The Mutual Association of Eastern Colored Clubs, known as the Eastern Colored League (ECL) was one of the several Negro Leagues, operating during the time organized baseball in the United States was racially segregated.
The American Negro League, (ANL) not to be confused with the Negro American League (NAL) was one of several Negro leagues established during segregation, operating on the East Coast of the United States for one season in 1929.
The East–West League was a professional baseball league formed during the period when baseball in the U.S. was segregated. The league was conceived 0f by Cum Posey in 1932. However, it didn't last the full year and folded in June of that year.
The second Negro National League II (NNLII) was founded in 1933 by Gus Greenlee as the second iteration to the former Negro National League I (NNLI), The Negro National League II (NNLII) enjoyed much broader success, lasting until integration.
The Negro American League was founded as a midwestern League in 1937, formed from clubs that had either played independently or in the Negro Southern League (NSL). It rivaled the Negro National League II, which had become the dominant eastern league in 1933.
The Liga Mexicans de Beisbol is a professional baseball league based in Mexico and the oldest running professional league in the country, with the league has 18 teams organized in two divisions, North and South with member teams participating in 114 games each season.
The Federación Cubana de Béisbol is the governing body of the sport of baseball within Cuba. In 2018, a deal was struck between MLB and the Baseball Federation of Cuba, so that cuban baseball players no longer had to defect to play professionally in the United States.
The United States Baseball League (USL), was one of the several leagues created during the time organized baseball was segregated. The league was specifically organized as a minor league by Branch Rickey to serve as a platform for outstanding African American talent.
Nippon Professional Baseball (NPB) is the highest level of baseball in Japan. Locally, it's Puro Yakyū, (Professional Baseball). The roots of the league can be traced back to the formation of the "Greater Japan Tokyo Baseball Club" (大日本東京野球倶楽部) in Tokyo, founded in 1934,