 Around the turn of the last century, they were known as the Racine Cardinals, and in 1920, they became a charter member of the American Professional Football League, which would eventually become the National Football League.Upon their move to Phoenix, the Cardinals originally played their home games at Sun Devil Stadium on the campus of Arizona State University in nearby Tempe.In 2006 they moved to the newly constructed then-named University of Phoenix Stadium in suburban Glendale.