First of all, all three citations are the exact same article "trump impeachment Updated on Sept. 30, 2019 The Impeachment Process Explained: What Happens to Trump Now? By Ed Kilgore." The article has nothing to do with your OP.
Second of all, not being able to review your "evidence" the assertion that we are where we are today thanks to "Newt Gingrich" is hard to credit.
Thirdly, power politics has been an ongoing process long before Mr. Gingrich took any office. IMO You give him too much credit, whatever your evidence.
The methods of propaganda and the perversions of public information have their roots long before any recent politician, starting with the yellow journalism of early printed reporting, through Goebbels' Ministry, through today's manipulation of the internet and other media by those who control it.
Moreover, opinion has it that radical changes in direction effected by socialist involvement in our educational system in the 60's, 70's, and 80's molding the minds of our youth and therefore society as a whole were/are also in play.
We used to be "better" because despite all it's faults we had a strong belief in our basic socio-political systems and the ideals uniting our nation. Now we have radical divisions separating us in ways more insidious and less obvious than the old racial divides.
We have grievance "pseudo-science," identity politics, political correctness, globalism, a hierarchy of oppression, gender dysphoria, etc., etc., ad nauseum being fed to our youth. Youth indoctrinated who then become adults pushing this divide amongst us. A divide clearly reflected in current politics.
So no, without having a chance to review your basis, I see nothing that shows the current "divide" can be lain at the feet of "Newt Gingrich."