The first nuclear weapon test, code-named "Trinity," took place in the New Mexico desert at 5:30 a.m. on July 16, 1945. This test was a proof of concept for the secret nuclear science taking place at Los Alamos as a part of the Manhattan Project during World War II and would lead to the atomic bombs being dropped on Hiroshima and Nagasaki, Japan, just a few weeks later.
Since those detonations, the development of nuclear weapons has accelerated. Countries around the world have built their own nuclear stockpiles, including over 5,000 nuclear warheads held by the U.S.
