Read a biography of Truman and either his or Bess’s family talked of “how some damned Kansas family was eating off of their china”. Although Missouri stayed in the Union, western Missouri was pretty much considered enemy territory and I believe residents were forced to abandon their farms and move to towns. Of course Missourians weren’t the innocents either, they conducted raids into Kansas before the Civil War. Caused at least two or three generations of resentment between the two states.
I had three great uncles from MO who ran with Quantrill and a Great Grandfather (their father) who provided financial support. They were force to fight when Redlegs came onto their land and hanged their mother’s brother for absolutely nothing. Antifa are the modern Redlegs.