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They dropped it an atomic bomb on hiroshima and then after on nagasaki. it happened incredibly fast from july 16th, the trinity test, until august 6th and 9th, those two bombs dropped on japan. and to this day, the united states remains the only nation in the world to have ever used a nuclear weapon against an adversary in wartime. but looking back on the aftermath of that first test and the aftermath of those bombings in japan, it's clear that a singular and defining feature of the era in world history is that for years we were alone in that capacity. for years the united states was the only ...

Until august 6th and 9th, those two bombs dropped on japan. and to this day, the united states remains the only nation in the world to have ever used a nuclear weapon against an adversary in wartime. but looking back on the aftermath of that first test and the aftermath of those bombings in japan, it's clear that a singular and defining feature of the era in world history is that for years we were alone in that capacity. for years the united states was the only country on earth that had an atomic weapon. again, our first atomic test was july 1945. it was not until four years after that that an...

Latest updates on this topic from reliable sources.

More powerful than an atomic weapon. so this would represent a considerable step-up in north korea's power if it is shown, and it may take months, if it is shown that this was, in fact, a hydrogen bomb test. shannon? >> all right an ongoing story. bill neely from london, thank you. back in the u.s., president obama is re-igniting an age-old battle with congress. in an emotional white house speech he outlined his new gun control executive order and calls out lawmakers for their inaction. nbc's tracie potts is live in washington for us this morning. tracie, conservatives are hitting back. >> w...