This is a question that gets asked a lot prior to a Spring season. Due to the size of our league relative to others in our district, Little League International requires us to divide our all star baseball teams into two separate teams at each age group in 9-12 baseball divisions. SCLL refers to them as American and National leagues similar to Major League Baseball.
Once a child enters 9-12 baseball as a league age 9 player during the Spring, they are assigned to either AL or NL as they are drafted that first year. For the duration of their time in Minors (AA, AAA, or a combined Minors division), and Majors Baseball, your child must remain in the same league. From each of those leagues, we form all star teams for the 8-10, 9-11, and 10-12 teams giving us a total of 6 all star teams in 9-12 baseball. During the regular season, our AL and NL teams will play each other.
To make it easier to determine which league your child is in, we mirror our teams and leagues with teams and leagues in MLB. The AAA Nationals for example would be a National League team and the AAA Orioles would be an American League team. Note - this only applies to Spring seasons.