Significant Dates in Baseball History
| Date | Description |
| 1899-08-11 | American League is formed |
| 1900-03-21 | St. Paul Saints of the Western League moved to Chicago and renamed White Stockings |
| 1900-04-21 | Chicago White Stockings renamed White Sox |
| 1901-01-28 | American League declared itself to be a second major league |
| 1901-04-24 | First "official" American League game is played |
| 1903-03-12 | New York Highlanders approved as member of the American League |
| 1913-04 | New York Highlanders renamed Yankees |
| 1968-05-27 | MLB awarded expansion franchises to Montreal (Expos) and San Diego (Padres) |
| 1970-04-01 | Seattle Pilots purchased by Bud Selig, moved to Milwaukee, and renamed Brewers |
| 1992-11-17 | MLB expansion draft (Colorado Rockies) |
| 1997-11-18 | MLB expansion draft (Arizona Diamondbacks and Tampa Bay Devil Rays) |
| 1999-06-02 — 1999-06-03 | 1999 MLB First-Year Player Draft |
| 2001-06-05 — 2001-06-06 | 2001 MLB First-Year Player Draft |
| 2001-06-04 — 2001-06-05 | 2002 MLB First-Year Player Draft (rounds 1-22 on day 1, rounds 23-50 on day 2) |
| 2004-09-29 | Montral Expos moved to Washington D.C. |
| 2004-11-22 | Washington Expos renamed Nationals |
| 2006-06-06 — 2006-06-07 | 2006 MLB First-Year Player Draft |
| 2007-06-07 — 2007-06-08 | 2007 MLB First-Year Player Draft |
| 2007-11-08 | Tampa Bay Devil Rays renamed Rays |
| 2008-06-05 — 2008-06-06 | 2008 MLB First-Year Player Draft (rounds 1-6 on day 1, rounds 7-50 on day 2) |
| 2009-06-09 — 2009-06-11 | 2009 MLB First-Year Player Draft (rounds 1-3 on day 1, rounds 4-30 on round 2, rounds 31-50 on day 3) |
| 2010-06-07 — 2010-06-09 | 2010 MLB First-Year Player Draft (rounds 1 and Compensatory A on day 1, rounds 2-30 on day 2, rounds 31-50 on day 3) |