And thd Spanish at least all spoke (not counting Catalan or Basque) one language, Spanish, and were all of one basic ethnic stock. Today we in the USA have a more complicated situation, with a large Spanish speaking minority in many parts of the country, and multiple races, white, black, etc. If anything, our CW could be uglier than Spain's, and that was hell on earth.
Yes, it might be similar to some of what we have been seein happen in Iraq recently.
It was many years ago I studied the Spanish Civil War. If you’re interested, the standard work then was by Hugh Thomas, ‘The Spanish Civil War’ (a huge work). The standard work on Spanish fascism and Jose de Rivera then was ‘The Falange’ by Taylor.
Sorry, on Spanish fascism the cite should be Payne, Falange, A History of Spanish Fascism.