America is not at risk of civil war for the foreseeable future, and definitely not because of Trump getting impeached. We've been through presidential impeachment scandals before, and many presidents like Nixon and Clinton who were impeached had very good approval ratings while they were in office as well. Trump's approval ratings are abysmal in most major urban centers, which is where most of our military power is located. We'll definitely get protests and riots, and maybe even a shooting or two, but this won't start a civil war. Civil war would require people inside the actual government revolt, not just a bunch of rural Americans that can be easily suppressed by the military.