Cold war nuclear arms race

Soviet Union

August 29, 1949
1953
Oct 4 1957
November 3 1957
Oct 23, 1962

United States

July 16, 1945
1952
January 21 1954
1958
August 7 1959
October 14, 1962

Both/Other

May 1945
July 24 1945
Oct 25, 1962
1963
March 17 1969