There is not a difference unless you catch an Official League Baseball.
The Super league and the higher league are the same.
In general those that follow union or league know the difference.
International League was created in 1885.
Nowadays there is no difference. But a ways back only Whites could play in the major league and African-Americans could play in the Negro League.
The premiere league is played in England only between the clubs from england. But the Champion league is played between clubs from Europe to find out the best club in Europe for that year.
The Negro League are men and I don't know the rest.
None. They umpire in both leagues.
1 league = 3.45233834 miles
Southwest International League was created in 1951.