response: Oh, that's nice. It's also called gridiron football, and played by 11 people on each team.
original_response: I do too. It is also known as gridiron football and is a team sport played by two teams of 11 players.
history: I love American football. It's probably my favorite sport.
knowledge: American football, referred to as football in the United States and Canada, and also known as gridiron football or simply gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end.