night between Labor Day and Thanksgiving weekend. Indoor football or arena football, a form of football played in indoor arenas, has several professional and semi-professional leagues. The Arena Football League was active from 1987 to 2008 and folded in 2009, but several teams from the AFL and its former minor league, af2, relaunched the league in 2010. The AFL folded again in 2019. Most extant indoor leagues date to the mid-2000s and are regional in nature. Dedicated women's football is seldom seen. A few amateur and semi-professional leagues exist, of varying degrees of stability and competition. Football is unique among scholastic sports in the U.S. in that no women's division exists for the sport; women who wish to play football in high school or college must compete directly with men. Indoor American football has several professional leagues such as, Indoor Football League, Champions Indoor Football, American West Football Conference, National Arena League, and American Arena League. Baseball Baseball and a variant, softball, are popular participatory sports in the U.S. Baseball was the first professional sport in the United States. The highest level of baseball in the U.S. and the world is Major League Baseball. The World Series of Major League Baseball is the culmination of the sport's postseason each October. It is played between the winner of each of the two leagues, the American League and the National League, and the winner is determined through a best-of-seven playoff. The New York Yankees are noted for having won more titles than any other US major professional sports franchise. The Yankees' chief rivals, the Boston Red Sox, also enjoy a huge following in Boston and throughout New England. The Philadelphia Phillies of the National League are the oldest continuous, one-name, one-city franchise in all of professional American sports, and enjoy a fanbase renowned for their rabid support of their team throughout Philadelphia and the Delaware Valley, and have famously been dubbed as the "Meanest Fans in America". Midwest baseball has also grown exponentially with teams like the Chicago Cubs, St. Louis Cardinals, Cincinnati Reds, and Milwaukee Brewers. Particularly with Chicago sports fans who avidly follow the Chicago Cubs and the Chicago White Sox despite the comparative lack of success for the teams, with Chicago Cub fans being known throughout the country as one of the best baseball fans in the country, most notably for their passionate loyalty to the team despite their