We'd all be in the crossfire. First of all, the percentage of Americans that would resist is much greater than you probably think, and the percentage of military that would defect either overtly or secretively (to stay behind and sabotage) is also much greater than you probably think.
Secondly, in case of civil war, countries like China and Russia aren't going to stay on the sidelines forever. They'll sit back and observe for awhile, sure, but at a crucial moment of weakness for us, they will make their move.
Instead of wrecking our country and forcing all survivors of the civil war to have to learn Chinese to please our slavemasters, how about you liberals try out a realistic solution?