What would it take for us to make civil war today?

Just a random thought I had today. Today we are much more pacifist than we would probably admit, and it is a stark contrast to the revolutionaries and abolishers of the America's glorious past. What would it take for a significant number of American people to revolt? I don't believe in murdering abortion doctors, but if we really believe this is genocide and on par with the atrocities of slavery or tyranny, what is the proper response to something like this?

This is probably a controversial thing to say, but I'm mostly must being hypothetical. Perhaps that says more about the pacifism than anything, that I'm blogging about it instead of pursuing actual justice.