National geographic eyewitness to the 20th century

1900-1909 : the age of big business

1910-1919 : the woman's decade

1920-1929 : the masses and tribalism

1930-1939 : the great depression

1940-1949 : birth of the atomic age

1950-1959 : the Cold War and McCarthyism

1960-1969 : challenging the establishment

1970-1979 : watching the world on TV

1980-1989 : "all right we are two nations"

1990-1999 : After the Cold War, the global society.