Although some of the geography of the NFL's present alignment is off (looking at you, Dallas), I'm going to keep the existing teams where they are and just add one new team to each division.

AFC
East: Buffalo Bills, Miami Dolphins, New England Patriots, New York Jets, Toronto Ospreys
North: Baltimore Ravens, Cincinnati Bengals, Cleveland Browns, Kentucky Colonels, Pittsburgh Steelers
South: Houston Texans, Indianapolis Colts, Jacksonville Jaguars, San Antonio Scorpions, Tennessee Titans
West: Denver Broncos, Kansas City Chiefs, Las Vegas Raiders, Los Angeles Chargers, San Diego Destroyers

NFC
East: Dallas Cowboys, New York Giants, Norfolk Knights, Philadelphia Eagles, Washington Warriors
North: Chicago Bears, Detroit Lions, Green Bay Packers, Minnesota Vikings, St. Louis Stallions
South: Atlanta Falcons, Carolina Panthers, New Orleans Saints, Oklahoma Oilers, Tampa Bay Buccaneers
West: Arizona Cardinals, Los Angeles Rams, Portland Beavers, San Francisco 49ers, Seattle Seahawks