In what year did the Baltimore Ravens play their first season?

In what year did the Seattle Seahawks play their first season? In what year did the Tampa Bay Buccaneers play their first season? In what year did the Carolina Panthers play their first season? In what year did the Jacksonville Jaguars play their first season? In what year did the Houston Texans play their first season? The Kansas City Chiefs were once known by which name? The New York Jets were once known by which name? The Detroit Lions were once known by which name?