What year was the NFL officially formed and named as such?
1922
1920
1920
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1933
1920
1922
1933
1920
1922
1933
1920
1922
1933
1920
1933
1920
1922
1933
1920
1922
1933
1922
1933
1933
1922
1922
1925
1922
1925
1922
1925
1925
1922
1925
1922
1920-1921
1925
1922
1919
1925
1890
1920-1921
1919
1925
1920-1922
1922
1890
1919
1920-1921
1925
1922
1920-1922
1919
1890
1925
1920-1921
1922
1919
1925
1920-1922
1890
1902
1919
1920-1921
1925
1922
1920-1922
1890
1932
1919
1902
1925
March 19, 1933
1933-32
1922
1920-1921
1920-1926
1919
1890
1932
1925
1930
1920-1922
1902
1920-1921.
March 19, 1933
March 7, 1933
1922
1919
1920-1921
1925
1930
1920-1926
1890
1932
1933-32
1920-1920
1869
1920-1922
1902
1919
1925
1930
1922
1920 NFL Championship Game
1933-35
1920-1921
1933-41
March 19, 1933
1920-1924
1890
1932
1920-1926
1933-33
March 7, 1933
1933.
1922.
March 31, 1933
March 19, 1920
1869
1919
1920-1920
1902
1925
1930
1920-1922
1933-32
1920 NFL
1920-1921.
1920, 1922
1914
1919
1890
1932
1920-1921
1925
1933.
1930
1920-1924
1920-1926
1869
1920-1922.
1922.
March 19, 1920
1902
1933-35
1920-1920
1920 NFL Championship Game
1933-41
March 3, 1933
1920-1922
1933-33
1920 NFL
1914
1933-32
1919
1925
1930
March 19, 1933
March 7, 1920
March 7, 1933
1890
1932
March 31, 1933
1933.
1920-1921
1869
1920 NFL Championship season
1920-1924
1920-1926
1914
1902
1922.
1920-1921.
1919
1920-1920
1920, NFL
1920 NFL