Wow. Let's see. College and high school football has been played since the late 1800s. Professional teams have been around since before 1900. By 1920, there were probably thousands of games being played annually.
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There were 11 in the NFL.
Brooklyn Dodgers
Chicago Cardinals
Frankford Yellow Jackets
Minneapolis Redjackets
Newark Tornadoes
Portsmouth Spartans
Providence Steam Rollers
Staten Island Stapletons
Four (4), the Ottawa Senators, Toronto St. Patricks, Montreal Canadiens and the Hamilton Tigers.