I have heard of this theory before, but it doesn't make sense to me.
Really from my research showed there was a cataclysmic event that happened. The younger dryas event, or even a super volcano eruption... and yes USA has one of them, its called Yellowstone.
Even to pole shifts (this is actually proven that this happens) can mess this up, or even a asteroid impact, extreme climate change.... to even a sun discharge
but a nuclear bomb, no
Something certainly happened I agree, and it definitely was much further back than when the mahabarata was written down. Yet I trust our ancestors far more than I do modern academia or media. Apparently there is some evidence for this stuff happening in radiation levels found in skeletons in harappa and what not, but it all comes down to dating the events and if the methods used are accurate.
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