There are currently 18 teams (America,Atlante,Atlas, Jaguares, Cruz Azul, Chivas, Monterrey, Tigres, Monarcas, Pumas, Indios de C. Juarez, Puebla, Tecos, San Luis, Santos, Toluca, Necaxa, and Pachuca)
There were 14 teams in the NFL's inaugural season in 1920. Of those, only two remain: the Bears and Cardinals. The Cardinals are older, having been founded in Chicago in 1898. The Bears began in 1920...