Short answers, pulled from the story.
The 1920 APFA season was the inaugural season of the American Professional Football Association, which was founded on the 17th of September, 1920, in Canton, Ohio. The APFA was the direct forerunner of the National Football League; it was reorganized as the NFL in 1922.
The Akron Pros were awarded the 1920 APFA championship at a league meeting on the 30th of April, 1921. They received the Brunswick-Balke Collender Cup, a silver loving cup donated by the Brunswick-Balke-Collender Company, which was used as the championship trophy only that one year.
Jim Thorpe, the Olympic champion and player-coach of the Canton Bulldogs, was named the APFA's first president at the organizational meeting in September 1920. He was chosen primarily for the publicity associated with his famous name rather than any administrative expertise.
The first official game between two APFA member clubs was played on the 3rd of October, 1920, at Triangle Park in Dayton, Ohio. The Dayton Triangles defeated the Columbus Panhandles 14 to 0; Lou Partlow scored the league's first touchdown and George "Hobby" Kinderline kicked the first extra point.
Two of the fourteen founding APFA clubs remain in the NFL. The Chicago Cardinals, now the Arizona Cardinals, and the Decatur Staleys, now the Chicago Bears, are the only surviving franchises from the 1920 inaugural season.
The Decatur Staleys and the Buffalo All-Americans both argued for the championship, citing more wins and the fact that neither had been defeated by the Akron Pros. Because there was no playoff system, owners voted on a champion, and the Pros won the vote due to their undefeated record. The NFL later lost track of this decision and published for years that the 1920 title was undecided; the vote was not rediscovered until the 1970s.