The NFL has changed a lot since it first started in 1920. There were twenty-eight teams in the NFL then. Players were smaller physically. During games players were interchangeable and played every play. That caused teams to have more two-way players. There were less offensive and defensive designed plays. African-Americans were banned from the NFL in 1933 to 1945. Most teams were run dominant so they rarely threw the ball. As years went on the NFL improved in numerous ways. Players had an increase in physical size. Players began to train to improve their game performance. The NFL grew to thirty-two teams. Each players size were specific for each position. The NFL increased the roster size and players salaries. Equipment improved for each players