What if the NFL and USFL Merged in 1987? (Part II)
Ranked: The Most Valuable NFL Teams in 2022
A look at the history of expansion and relocation in the NFL, Raiders/NFL
What are the expansion teams in the NFL? - Quora
The history of NFL Expansion and Realignment : r/nfl
NFL plan to expand overseas involves flag football at the Olympics
NFL expansion cities: San Diego, Portland, Montreal, more - Sports Illustrated
Timeline of the National Football League - Wikipedia
How did your NFL team gets its name? Origins explained for all 32 - ESPN
History of NFL Logo Designs & Their Evolution Through the Years