When will the United States be a graveyard?

I woke up one morning with a thought about the quantity of ancestors I would have if I walk back to Jesus times. Assuming I go back 30 generations there should be close to 1 billion ancestors of mine. This has to be some kind of paradox since I’m certain 1 billion human souls weren’t alive in the yonder of 0-39AD. I decided to work the opposite way and ask myself “How many human beings would it take that, if all were buried in the ground at the end of their happy life it would make the United States a complete graveyard?”. I expanded this though to wonder at what year that would occur, too.

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