We already have a civil war. It started many decades ago, over half a century, but they did start calling it a war in the 60s. "The war on drugs" is really a war on racial minorities and political dissidents. It is the US government against the US people. An aide from the Nixon administration has even directly admitted that's what the "war on drugs" was meant to do: disenfranchise racial minorities, disrupt their communities, block political dissent. We're locked up and turned into political prisoners over this war. At what point does the phrase "prisoner of war" become appropriate to describe these political prisoners?
Furthermore, we are enslaved in for-profit prisons over these political "crimes", all thanks to the 13th amendment leaving a deliberate loophole to force convicted criminals into slavery. The police are militarized more now than ever, and they kill us with legal impunity too. Philando Castile was murdered apparently because the armed gunman of the state thought he smelled cannabis in his car. These issues intersect in such a way that the state targets black men deliberately, making slaves out of them once more despite slavery supposedly ending a long time ago.