Short answers, pulled from the story.
The first recorded American football game took place on the 6th of November 1869. Rutgers and Princeton faced each other in this match which used soccer rules with a round ball that players could not carry.
Walter Camp joined Yale as captain in 1878 and later became known as the Father of American Football. He introduced the snap to replace the chaotic scrum in 1880 and reduced team sizes from fifteen to eleven players per side.
The National Football League began operations in 1920 under the name American Professional Football Association. By 1922 it had established itself as America's premier professional league.
A football game lasts sixty minutes divided into four quarters of fifteen minutes each. Teams switch goals after the first and third quarters while the offense must advance the ball ten yards within four downs or lose possession.
Flag football will debut as an Olympic sport at the 2028 Summer Games in Los Angeles. International federations exist across Africa Asia Europe Oceania and the Americas totaling seventy-five national bodies.