The 1890 Brooklyn Bridegrooms left the American Association and joined the National League. They won the league championship, becoming one of a select few teams to win championships in different leagues in back-to-back seasons.

The Los Angeles Dodgers are an American professional baseball team based in Los Angeles. The Dodgers compete in Major League Baseball (MLB) as a member club of the National League (NL) West Division. Established in 1883 in the city of Brooklyn, which in 1898 became a borough of New York City, the team joined the NL in 1890 as the Brooklyn Bridegrooms and assumed several other monikers before finally settling on the name Dodgers in 1932. From the 1940s through the mid-1950s, the Dodgers developed a fierce crosstown rivalry with the New York Yankees as the two clubs faced each other in the World Series seven times, with the Dodgers losing the first five matchups before defeating them to win the franchise's first title in 1955. It was also during this period that the Dodgers made history by breaking the baseball color line in 1947 with the debut of Jackie Robinson, the first African American to play in the Major Leagues since 1884. Another major milestone was reached in 1956 when Don Newcombe became the first player ever to win both the Cy Young Award and the NL MVP in the same season.