| Progression of MLB expansion | ||
|---|---|---|
| Years | No. of AL teams | No. of NL teams |
| 1901–1960 | 8 | 8 |
| 1961 | 10 | |
| 1962–1968 | 10 | |
| 1969–1976 | 12 | 12 |
| 1977–1992 | 14 | |
| 1993–1997 | 14 | |
| 1998–2012 | 16 | |
| 2013–present | 15 | 15 |
Major League Baseball (MLB), the highest level of professional baseball in the United States and Canada, has undergone several rounds of expansion beginning in 1961, eventually reaching 30 teams with its most recent expansion taking place in 1998. MLB has discussed preparations for another round of expansion. Several investment groups are vying for an MLB franchise.