Apart from anything else, the OP suggests he has little idea how bad the 1861-65 war actually was.
It was horrific, but there was a clear geographic division in terms of which side was which. A second civil war would be more like what we see in Syria or Yemen.
Double plus wrong... the [civil?] wars in Syria or Yemen would be long over, if not for foreign (pro-western) intervention - In Syria - either the opposition would have held together without external support for ISIS et all - and thus might have won - OR - Assad would have won long ago, if not for the meddling of Erdogan and the US... / In Yemen - the Houthi would have won long ago, if not for the massive Saudi- and Emirati intervention, without sufficient boots on the ground to really win...
But in a future US civil war, the blood-toll might be horrible, but most likely, one side would start to dominate in some areas - so it would become a failed state with regional powers - or one side would emerge dominant and thus might become victorious... It's - given the size of the country - however -unlikely that foreign powers would try to oppose the victorious side by propping up regional resistance... (unlike the US did in the case of Taiwan, when Mao won the Chinese Civil war // rather more like no foreign power continued to support the "whites" after they lost the Russian Civil war...)
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