Development of Nuclear Threat
1942 1st nuclear chain reaction
University of Chicago
(fission of uranium isotope U-235 fusion)
1945
July 16 1st atomic bomb dropped
(Los Alamos) Trinity
August 6 2nd atomic bomb dropped
(Hiroshima) 80,000+ killed
August 9 3rd atomic bomb dropped
(Nagasaki) 100,000 + killed
1949 Soviet Union drops their first atomic bomb
1952 the first Hydrogen bomb is dropped