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This is alist of seasons of Major League Baseball.
| Year | National League champion |
|---|---|
| 1876 | Chicago White Stockings |
| 1877 | Boston Red Caps |
| 1878 | |
| 1879 | Providence Grays |
| Year | National League champion | American Association champion | Union Association champion | World's Championship Series champion |
|---|---|---|---|---|
| 1880 | Chicago White Stockings | – | – | – |
| 1881 | – | – | – | |
| 1882 | Cincinnati Red Stockings | – | – | |
| 1883 | Boston Beaneaters | Philadelphia Athletics | – | – |
| 1884 | Providence Grays | New York Metropolitans | St. Louis Maroons | Providence Grays (3–0) |
| 1885 | Chicago White Stockings | St. Louis Browns | – | Tie,Chicago White Stockings andSt. Louis Browns (3–3–1) |
| 1886 | – | St. Louis Browns (4–2) | ||
| 1887 | Detroit Wolverines | – | Detroit Wolverines (10–5) | |
| 1888 | New York Giants | – | New York Giants (6–4) | |
| 1889 | Brooklyn Bridegrooms | – | New York Giants (6–3) |
| Year | National League champion | American Association champion | Players' League champion | World's Championship Series / Temple Cup champion |
|---|---|---|---|---|
| 1890 | Brooklyn Bridegrooms | Louisville Colonels | Boston Reds | Tie,Louisville Colonels andBrooklyn Bridegrooms (3–3–1) |
| 1891 | Boston Beaneaters | Boston Reds | – | – |
| 1892 | – | – | Boston Beaneaters (5–0–1) | |
| 1893 | – | – | – | |
| 1894 | Baltimore Orioles | – | – | New York Giants (4–0) |
| 1895 | – | – | Cleveland Spiders (4–1) | |
| 1896 | – | – | Baltimore Orioles (4–0) | |
| 1897 | Boston Beaneaters | – | – | Baltimore Orioles (4–1) |
| 1898 | – | – | – | |
| 1899 | Brooklyn Superbas | – | – | – |
| Year | American League champion | National League champion | World Series /Chronicle-Telegraph Cup champion |
|---|---|---|---|
| 1900 | – | Brooklyn Superbas | Brooklyn Superbas (3–1) |
| 1901 | Chicago White Stockings | Pittsburgh Pirates | – |
| 1902 | Philadelphia Athletics | – | |
| 1903 | Boston Americans | Boston Americans (5–3) | |
| 1904 | New York Giants | – | |
| 1905 | Philadelphia Athletics | New York Giants (4–1) | |
| 1906 | Chicago White Sox | Chicago Cubs | Chicago White Sox (4–2) |
| 1907 | Detroit Tigers | Chicago Cubs (4–0) | |
| 1908 | Chicago Cubs (4–1) | ||
| 1909 | Pittsburgh Pirates | Pittsburgh Pirates (4–3) |
| Year | American League champion | National League champion | Federal League champion | World Series champion |
|---|---|---|---|---|
| 1910 | Philadelphia Athletics | Chicago Cubs | – | Philadelphia Athletics (4–1) |
| 1911 | New York Giants | – | Philadelphia Athletics (4–2) | |
| 1912 | Boston Red Sox | – | Boston Red Sox (4–3) | |
| 1913 | Philadelphia Athletics | – | Philadelphia Athletics (4–1) | |
| 1914 | Boston Braves | Indianapolis Hoosiers | Boston Braves (4–0) | |
| 1915 | Boston Red Sox | Philadelphia Phillies | Chicago Whales | Boston Red Sox (4–1) |
| 1916 | Brooklyn Robins | – | Boston Red Sox (4–1) | |
| 1917 | Chicago White Sox | New York Giants | – | Chicago White Sox (4–2) |
| 1918 | Boston Red Sox | Chicago Cubs | – | Boston Red Sox (4–2) |
| 1919 | Chicago White Sox | Cincinnati Reds | – | Cincinnati Reds (5–3) |
| Year | American League champion | National League champion | World Series champion |
|---|---|---|---|
| 2020 | Tampa Bay Rays | Los Angeles Dodgers | Los Angeles Dodgers (4–2) |
| 2021 | Houston Astros | Atlanta Braves | Atlanta Braves (4–2) |
| 2022 | Philadelphia Phillies | Houston Astros (4–2) | |
| 2023 | Texas Rangers | Arizona Diamondbacks | Texas Rangers (4–1) |
| 2024 | New York Yankees | Los Angeles Dodgers | Los Angeles Dodgers (4–1) |
| 2025 | Toronto Blue Jays | Los Angeles Dodgers (4–3) | |
| 2026 |