World Series appeared in 9 and won 5. As of 2018, no team has won consecutive World Series championships since the New York Yankees in , , and —the longest such drought in Major League Baseball history. Until the formation of the American Association in 1882 as a second major league, the National Association of Professional Base Ball Players (1871–1875) and then the National League (founded 1876) represented the top level of organized baseball in the United States. All championships were awarded to the team with the best record at the end of the season, without a postseason series being played. From
2015 World Series to win the World Series after losing in the previous year. It was the first World Series to feature only expansion teams and the first since the 2007 World Series to not feature the Philadelphia Phillies, St. Louis Cardinals, or San Francisco Giants as the NL champions. The Royals had home field advantage for the first two games of the series because of the AL's 6–3 victory in the Major League Baseball All-Star Game. It was the 13th World Series in which home field advantage was awarded to the league that won the All-Star Game, a practice that was discontinued