My great grandparents were born in Texas [1870s, maternal side.]. I know that his parents had been from Missouri but left right after the Civil War. His father was 1/4 Powhaton Indian and, in turn, His grandfather was a veteran of the American Revolution and fought with the Virginia regiment whom having lost his wife to childbirth [Her second] in the mid 1790s when she was in her forties, decided to give his farm to the grown son [whom was born in 1777] and the infant daughter and at around age 52-53 took a new bride, a young Powhaton woman, and went off into the Kentucky/Ohio wilderness around 1802-3 and began anew and had three more sons.
To be living in Lafayette county in the 1850s-60s and be a 'secessionist', and a 'half breed' to boot, was a recipe for trouble...and trouble came, in droves. [We were not slave owners nor did the family believe in 'slavery'. The great grandfather that fought for Virginia was, in fact himself, the great grandson of Richard Hough of Bucks Co. Penn. A Quaker, that was one of the 'inner cadre' of associates of Wm. Penn, whom arrived in America in 1685. The Virginian, was a Quaker himself and chose to take up arms due to the urging of, Mennonite Bishop, Christian Funk. The Mennonites {Anabaptists like the Quakers} that took up arms became known as "Funkites". Those of the Quaker faith became, what is known as, "Free Quakers". They were all, forever more, ostracized from their congregations for having taken up arms.]
I believe that the men may have rode with Quantrell or Capt. Anderson and were likely involved with the little 'excursion' into Lawrence, Kansas. [The book "Woe To Ride On" or the movie made from the book, "Ride With the Devil", {a most faithful rendition of the historical novel} do provide much insight into the facts of 'the way it was'.]. There were many in Missouri and another "Border State", Tennessee, that were Secessionists. When the war 'turned' inescapably toward favoring the North, these people had to leave...and most had to in a hurry.
In 2001, when I was anticipating a settlement soon for my workers disability lawsuit, against my former employer, and subsequent retirement, [little did I know then that it would drag on for another six long years] I researched places in the U.S. I was considering, at that time, to move to. I found out that, as of the year 2000, 75% of the [then] present Caucasian population of the state of Texas were direct descendants, on at least one side of their family, from Secessionists from either Missouri or Tennessee that had left those States during or immediately following the Civil War.
That should give you all some insight as to why Texans are the way they are.