In which u. s. state was the first atomic bomb test successfully exploded?

New Mexico

if you're interested, the code name given to the first atomic bomb testing was "Trinity"

New Mexico.

Do you know why they had to use two atomic bombs on Japan? It was because the atomic bombs were just invented.  They were so new,that Japan thought they wouldn't have any more left after Hiroshima. They gambled, and they lost.  Japan surrendered quickly after the scond bomb, in Nagasaki.