Which NFL team was originally founded as the Dallas Texans?

The NFL team originally founded as the Dallas Texans was the Kansas City Chiefs.

The franchise was established in 1959 by Lamar Hunt as one of the original teams in the American Football League. It began playing in 1960 as the Dallas Texans, sharing the Cotton Bowl with the NFL's Dallas Cowboys. Although the Texans won the 1962 AFL Championship, Hunt concluded that Dallas could not support two professional football teams.

Hunt moved the franchise to Kansas City in 1963 after an invitation from Mayor Harold Roe Bartle. The team adopted the name Chiefs, while retaining the red-and-gold colors that had been associated with the Texans. This history is often confused with the Houston Texans, a completely separate expansion franchise that began NFL play in 2002.

The Chiefs joined the NFL in 1970 when the AFL and NFL merged. Their final season as the Dallas Texans ended with an AFL title, and they won Super Bowl IV the following January as the Kansas City Chiefs.