query: When did the American Football League end?
passage: American Football League
The American Football League (AFL) was a major professional American football league that operated for ten seasons from 1960 until 1969, when it merged with the older National Football League (NFL). The upstart AFL operated in direct competition with the more established NFL throughout its existence. It was more successful than earlier rivals to the NFL with the same name, the 1926, 1936 and 1940 leagues, and the later All-America Football Conference (which existed between 1944 and 1950 but only played between 1946 and 1949).
passage: Professional American football championship games
The Ohio League and New York Pro Football League were two prominent regional associations in the 1910s (the NYPFL held an actual championship game in 1919). In 1920, teams from the Ohio League and New York Pro Football League, along with other midwestern teams, formalized into the American Professional Football Association (APFA), and the league was later renamed the National Football League (NFL). The NFL conducted play for thirteen years before creating a ""championship game"". From 1920 through 1932, league ""champions"" were determined by won-loss record, but the schedules and rules were so ill-defined that conflicts exist to this day over who the actual champions were.