With Donald Trump, three men have now been elected president who were born during a single 66-day period in mid-1946.

The statistics are boggling — three presidents out of the 841,000 babies born in June, July and August of that first post-war year. In contrast, the 55 million members of the Silent Generation (born between 1925 and 1945) failed to produce a single president.

These three successful graduates of the Electoral College had wildly different backgrounds. George W. Bush (July 6) was born into the WASP governing elite with his grandfather, Prescott Bush, soon to be elected senator from Connecticut. Trump (June 14) was blessed with money from his outer-borough New York City real estate developer father, Fred, but lacked social pedigree. And Bill Clinton (Aug. 19) had nothing beyond a devoted mother, Virginia Kelley.

But all three future presidents came into a world under the shadow of the atomic bomb.

On the day Trump was born, financier Bernard Baruch presented to the fledgling United Nations an American arms-control plan under which the United States would give up its atomic arsenal if other countries would abandon the nuclear option. After the Soviets balked, the United States on July 1 conducted an atom-bomb test (the first since World War II) on tiny Bikini Atoll in the Marshall Islands.