For book-length speculations on the probability, process and outcome of a second U.S. civil war, see Thomas Chittum's Civil War Two. The drastic upheaval of a civil war would probably unleash racial cleansing of the nation by the victors, including advanced eugenics-type and DNA-altering methods. See also the more temperate analysis, Alien Nation, by a former Englishman, now U.S. immigrant, Peter Brimelow .