Historical accuracy

This is an analysis of history accuracy of the setting Songs of the Waste Land since a lot of people seemed to be confused on some parts of chapter 1 this is not a meant to be an attack or defense for this manhwa. Please correct me on any mistakes I make. Chapter 1 starts off with the introduction of Gerald who comes from a wealthy family the phrase Blue-Blooded means some who comes from nobility descent or is high class. When the civil war started Gerald join due to his father pressuring him into it. This was common at the time as many sons went to war for a sense of duty, maintain the constitution, or in Gerald case his father wanted to gain economic and political advantages. Its important to note that despite Illinois being a union state its economy still relied on slave labor from the south and had Black laws/Codes(discriminatory legislation towards POC) The Ranch that Gerald inherits is located in Arizona/Utsh Monument Valley which is in the South its important to note Arizona was not a state at the time but a southern territory I bring this up because by this time in the story slavery is already abolished nationwide with the ratification of the 13th amendment but many southern states still had slaves due to legal loopholes, discriminatory laws, suppressing the news of slavery abolishment, lack of funds to travel, or deep family roots in Gerald case it seems many of them stayed due to lack of funds to travel and choose to stay at the Ranch. Also calling Gerald young master is history accurate as even with the abolishment of slavery some POC still called white people master out of habit, fear of retaliation or economic necessity. With the introduction of Ezra it is mentioned that he is a mixed race Native American Cattle Worker and is referred to as a cowhand, this is historically inaccurate as Cowhand is used to for white workers while cowboy at the time used used as a derogatory slur used to describe POC cattle workers. His name Ezra comes the biblical name azaryahu which means help, helper, or gods helper which fits his character as shown in the trailer of Ezra helping Gerald cope with his ptsd. While we don’t know the exact ethnicity of Ezra given the time period and location he is most likely from the Navajo tribe and is half white which is extremely sad because it heavily implies that Ezra a product of as it was common for white men at the time to SA Native American women and black women and if they were pregnant the child was sold into slavery or they were accepted members of Native American tribes. It’s important to note after the civil war the western indian war started which was the American government wanting to expand their territory into Native American land which resulted in the massacre, mass displacement, and cultural erase of native americans which heavily implies this happen to Ezra and he wants revenge on Gerald for inheriting his stolen land considering the revenge tag on manta