[RyMACtizzle]

United States Baseball League in 1900 with 20 teams
expands in 1926 to 24 teams
expands in 1940 to 28 teams
expands in 1950 to 32 teams
expands in 1960 to 36 teams
expands in 1970 to 40 teams
expands in 1980 to 44 teams
expands in 1990 to 48 teams

American Baseball Federation in 1900 with 10 teams
retracts in 1907 to 8 teams
retracts in 1914 to 6 teams
retracts in 1919 to 4 teams
folds in 1920

USBL Class A in 1920 with 20 USBL affiliates and 2 independent teams
expands with USBL
teams relocate when city/metro area gets a USBL franchise

College Association in 1920 with 16 teams (Ivy League and Patriot League)
expands in 1930 to 28 teams
expands in 1935 to 38 teams
folds in 1950 with founding of NCAA

USBL Class B in 1930 with 24 USBL affiliates
expands with USBL
teams relocate when city/metro area gets a USBL franchise

USBL Class C in 1940 with 28 USBL affiliates
expands with USBL
teams relocate when city/metro area gets a USBL franchise

National Collegiate Athletic Association in 1950 with 98 teams and 11 conferences
expands in 1980 to 160 teams and 18 conferences (80s era NCAA)
starting in 1980, conference champions get an auto-bid and at-larges are based off of computer ratings
expands in 2010 to 178 teams and 20 conferences (2010s realignment era NCAA)

National Intercollegiate Athletic Association in 1950 with 200 teams (No custom uniforms and logos)

Elite Baseball Academy (High School League) in 1975 with 100 teams (Some custom uniforms and logos)

National Junior Collegiate Athletic Association in 1985 with 100 teams. (No custom uniforms and logos)