The proliferation of nuclear weapons, 1945-2010
At at-a-glance overview of how nuclear technology spread across the globe, thanks to infographic geniuses at The New York Times

In 2008, The New York Times created an infographic based on the book The Nuclear Express: A Political History of the Bomb and its Proliferation — charting how nuclear weapons have proliferated among nations since the United States became the first "nuclear state" in 1945. Though the chart is somewhat dated, it is still a fascinating look at how transfers of nuclear secrets and technology have unfolded over 65 years.
See the full infographic at The New York Times
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