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The battle of Fredericksburg was lost by the Union because the new commander, Ambrose Burnside plans and tactics were unsuccessful.
It is the Permian-Triassic extinction event that took place around 252 million ago, nearly everything died. That's the main reason for it being called the great dying. It was caused by THE WHOLE PLANET ERUPTING INTO FLAMES FROM VOLCANOES, so it was pretty bad
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