| 1839 | Baseball is invented | Abner Doubleday created the game of baseball in his own backyard. He lived in New York. |
| 1845 | The rules of the game are made | Alexander Cartwright made the rules of baseball, including three strikes and you're out! |
| 1846 | The first official game is played | The first official game was played between a team called the Knickerbockers and a team of cricket players. |
| 1866 | A women's baseball team is started | A women's ball team was formed by students at Vassar College. |
| 1867 | The first curve ball is thrown | The first recorded curve ball was thrown by Candy Cummings. |
| 1869 | The Boston Red Stockings is formed | Another pro team was formed, this time in Boston. They were called the Boston Red Stockings. |
| 1876 | The first baseball league is formed | The National League was formed by William Hubert. |
| 1882 | The American Baseball Association is started | Another league was begun in 1882. It was called the American Baseball Association, or the Beer and Whiskey League. |
| 1884 | The first African-American in baseball | Moses Fleetwood Walker became the first African-American to play professional baseball. |
| 1903 | The World Series is created | The first World Series was played between the Pittsburg Pirates and the Boston Pilgrims. |
| 1904 | A woman plays pro ball | A woman named Alta Weiss was the first woman to play pro baseball. |
| 1912 | The first baseball strike goes into effect | Players went on their first strike. It wouldn't be the last. |
| 1929 | Babe Ruth makes baseball history | Babe Ruth hit his 500th home run, making baseball history. |
| 1936 | The Baseball Hall of Fame is opened | The Baseball Hall of Fame opened in this year. They inducted five players into their first Hall of Fame. |
| 1943 | The first All-American girls' team is formed | During WWII, when many of the players were fighting overseas, the All-American Girls' Team was formed. |
| 1947 | The World Series on the big screen | 1947 was the first year that the World Series was played on television. The baseball fever caught on, and baseball is still one of the most popular sports in America today! |
