6. Chicago Bears (1940–1946)

The Chicago Bears established themselves as a powerhouse by winning four NFL championships in seven years, revolutionizing the game with their innovative T-formation offense under coach George Halas. Their historic 73-0 victory over Washington in the 1940 NFL Championship remains the most lopsided win in league history. The Bears’ tactical innovations not only led to on-field dominance but also influenced the evolution of offensive football strategies for generations. Learn more about the Bears’ historic run and its impact at Pro Football Hall of Fame.