On Aug. 6, 1945, the United States dropped an atomic bomb on the city of Hiroshima. On Aug. 9, 1945, a second bomb was dropped on Nagasaki. The bombings resulted in thousands of causalities in Japan.

The Atomic Museum in Las Vegas explains to visitors that Nevada and other states also played a role — for better or worse — in the creation of nuclear energy. By Michael Janofsky Reporting from Las ...