2002 was their inaugural season. 2002 was their inaugural season.
The Dallas Cowboys entered the NFL in 1960. In fact, from 1960-1962, Dallas also had the Dallas Texans of the AFL, who became the Kansas City Chiefs. Dallas also had a previous NFL franchise called the Dallas Texans, who played one season, 1952.
The Houston Texans joined the NFL in 2002.
Originally called the Dallas Texans, the chiefs moved to Kansas City and entered the NFL during the NFL-AFL merge in 1970.
The Houston Texans joined the NFL in October, 1999. They began playing in 2002 after their new stadium was built.
The Texans were the only team to join that year. From the time the Cleveland Browns rejoined the league in 1999, the NFL had 31 teams until the Texans joined.
The 2009 season with be the Texans' 8th season in the NFL.