Comment Re:Finally, Congress shall have the power (Score 1) 118
Either of those definitions could easily happen in the U.S.
Indeed. Although, those seem to me to be the kind of redefinition used to make things fit within a stronger word that shouldn't. Kind of like happened with the words "rape", "terrorism", "racism", "violence", and so many others. Be as it may, yeah, under those weak definitions, a civil "war" in the US is indeed possible.
Suppose Arkansas and Oklahoma decide to secede and the U.S. sends in troops to put the country back together again by force. Most people would consider that to be a civil war, assuming it drags on as long as it probably would, but your definition would require wiping out the entire population of Arkansas in the first year, and almost the entire population of Oklahoma in the second. That's a nonsensical number.
The worst civil war in the history of the world in terms of the casualty rate was probably the American Civil War. Only about 0.6% of the population died during each of those four years, on average. And that was in an era when wars were somewhat messier, because people tended to die from what would be considered relatively minor injuries today. Now that we have antibiotics, modern surgical techniques, etc., there's just no way a civil war in the modern era could possibly hit 1% of the population dying every year, even in a third-world country, much less a first-world country. You're at least an order of magnitude too high for a hypothetical second American civil war, and realistically, probably two.
For comparison purposes, the Syrian civil war, which almost nobody would rationally say was not a civil war, given that it ultimately led to the government being overthrown, only killed about 0.27% of the population each year. And the Chinese Civil War that resulted in the establishment of the PRC killed about 0.1% of the population each year on average (though I did not check individual years for any of these wars, and there probably were years with much higher and lower numbers of casualties).
So the problem is not that the definitions I provided are too weak, but rather that your definition is laughably unrealistic, and would mean that in the entire history of the modern world, there has never been a civil war.