It didn't. Negros wern't allowed to play the in the same league as whites, but when Jackie Robinson joined the white league other negros tried to and eventually they became the same league.
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Negro Leagues Baseball Museum was created in 1990.
The Negro Leagues
Jackie Robinson made it and encouraged others.
The negro leauges brought over the idea of night games by introducing lighting syytems to staduims
After the integration of professional baseball two factors combined to bring about the collapse of the Negro Leagues: (a) the best players from the top Negro League teams were signed by Major League organizations, thus weakening the top Negro League teams, and (b) the interest of black fans was quickly drawn away from the Negro Leagues as they focused their interest on the performance of Jackie Robinson and other black pioneers in the major leagues