There is a new massive "caravan" headed to the American southern border (not many women -- of course).
No doubt there are the usual band of leftist NGO's prodding them on.
If you really want to start a civil war, this is it. When they arrive, the new "Democrat" (are they really Democrats anymore?) governor of Texas will of course lay the welcome mat down for these new replacement leftist voters. The federal government and executive branch (the president and law enforcement departments) will continue to enforce the laws passed by congress and defend against literal invasion. At some point there will be an inevitable confrontation. Adding fuel to the fire, mobs of well organized leftists, funded and directed from several socialist/communist organizations (and probably some UN assistance). "Sombody could get hurt." Actually, somebody will get hurt -- or worse. The leftists will consider this collateral harm...for the cause.
Voila, Fort Sumter.
Is there a single individual to blame?...yes, after Biden, senator John Thune has facillitated a possible demise of America. In the end, we may have to count on all those "good ole boys" in the heartland who have the means to defend.
...Fireworks.