Nuclear era that began in 1945 poses moral questions for the 21st century

The Japanese cities of Hiroshima and Nagasaki were destroyed by atomic bomb explosions 75 years ago this August, hastening the end of World War II.And while a nuclear arms race emerged during the 1960s before arms control agreements took hold in the 1970s and 1980s, such weapons have not been deployed in warfare since.

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