What are the major associations in AI?

In 1987, Mattingly tied Dale Long's major league record by hitting home runs in eight consecutive games, as well as setting an American League record by getting an extra base hit in ten consecutive games. Also that season, he set a major league record by hitting six grand slam home runs in a season, (the record has since been tied.) Mattingly's grand-slams in 1987 were the only six of his career.