Many of us realized a good while ago that we were not in "America" anymore -- you know, the one that built the Bomb, won WWII, landed on the Moon, created the PC and the Internet -- THAT America.
"The Decadent Society" is one good book that covers our degree of lostness ... there are others linked there.
I'd argue that we have been divided from the beginning, as everyone and every human institution is -- between "Control and Chaos" ... we "boiled over" in the Civil War, to some degree in the 1960's, and it looks like we are at it again.
I think the linked is a worthy read if only as a root for some books that appear to be good .., I have "The Metaphysical Club" on order.
The other big division is between being a practicing Christian and not being so. Everyone has a "god", and for a much larger percentage of the population today, the "god" they believe they have is government -- sadly, they are wrong in that assumption. The Bible makes it clear, you either serve God or Satan, when you cease to regularly participate in the Divine Service with the Body and Blood, Satan, like the dog waiting for table scraps, is there to take your reins.
Government is a particularly nasty false god, since it has the power of the sword and the purse. Our Constitution split government into three branches with the hope that "faction" -- jealousy of power, would limit the dangerous "Leviathan" and keep government as the servant of the people, who were in turn servants of God. It was a wonderful architecture -- but it required a religious people in order to continue to operate.
So we are sadly divided with no shared foundational belief as to what this territory of N America formerly the "United States", holds as "truth" -- clearly in this failed state, there is no such thing for a majority approaching "self evident" truth. We are supposed to be "woke" to the tragedy of "Critical Theory".
Well, at least it isn't critical "fact" ;-(.