1920
1947
1953
1961
1937
1976
The Chicago Cardinals moved to St. Louis in 1960, and then to Phoenix in 1988.
1933
2003
The Vikings joined the NFL as an expansion team in 1961.
1921
The Atlanta Falcons entered the NFL in 1966, they went 3-11.
Answer1970, but they entered the AFL in 1959.