@Olivier5,
Roughly equal as expected.
The results of this polling may have been reflected during some period in pre 1950's America (I imagine the
divide was pretty wide during the Civil War), but it's worse now than at any other time in my life and has been steadily growing worse ever since the 60's.
The obvious question is: "Where will it end?"
No one can predict with certainty the full arc of this unfortunate trend, but I think its going to get worse before it gets better. I sure hope I'm wrong.
Without a catastrophic upheaval of one sort or the other, it's difficult to image a conflict resembling the Civil War breaking out. Whatever side controlled the power of the US military would overwhelm the other with complete ease. It would require a split along State lines to create anything like the Confederacy that would have, at least, some resources and capability to create something that looked like a rebel army, and even then, if the US military remained essentially loyal to the Union, which I believe would likely be the case (at least initially) there would be no protracted war like we had in the mid 1800's. There might be a few "battles" but in all of them the US military would easily win.
Much more likely would be a guerilla fought insurgency in which relatively casualty free attacks on government institutions and installations would eventually give way to acts of violent terrorism, but even this is, in my opinion, unlikely to occur.
I do expect acts of politically motivated violence to increase, but if they ever reached a critical mass that suggested that an organized and determined insurgency (whether carried out by a single group or a network of groups) was at work and not going to be stopped by "normal" criminal justice enforcement efforts, whatever government is in power at the time will, to one degree or the other, abandon the Constitution in an all out effort to restore the peace. Here again, the unrestrained or even less restrained power of the federal government will eventually overwhelm the opposition. We will have lost many of our freedoms (perhaps for a very long time), but peace will have been restored.
I'm not even predicting this as an eventuality though. The divide is very deep and very wide, but I still have faith in the great majority of American citizens, regardless of their ideology. Acts of politically motivated violence will increase, but not, I think, much beyond a point where Americans will say "enough is enough" and will not only demand change, they will participate in it. At that point "normal" criminal justice enforcement will be sufficient to put an end to any even loosely organized insurgency.
(Of course I'm feeling optimistic today. Just spent a long weekend with my grandson. Now that he's gone, my hope for a better tomorrow may recede, and I'll be back to predicting a break up of the Union)