I am in possession of some literature that includes personal biographies/histories of my ancestors from the US Midwest in the mid-to-late 1800s.
In one of the stories, an ancestor of mine has a conversation with a Native American. In the course of the conversation, my ancestor teases the Native American by asking him if he is Black (I think he actually says "Are you a nigger?", but I don't have the story in front of me) and he becomes very offended because (as it is explained in the story) it is well-known that the Native Americans hate Blacks.
Does anybody have any idea why this might be? I have never come across anything else to suggest the state of relations between Blacks and Native Americans in the US Midwest otherwise.
EDIT: I should also say that this story probably takes place in Iowa
While not the Midwest here is a good read about the Narrangansett People in Rhode Island.
https://www.jstor.org/stable/483031?seq=1#page_scan_tab_contents
Hatred for blacks in that area came because colonial officials attempted to dispossess the natives of the area by lumping them under "mustee" first but then eventually under the term "Negros". By taking away their inheritance/cultural identity, colonists could start making claims on former Narrangansett land that was left without a legal heir. Natives hated this cultural assault and any association with the word negro. You can see how this would lead to resentment for African Americans in the area.
From pg 446. there is a great public record that shows how quickly natives become negros under official public record:
Warnouts (moved to original town to collect poor benefits):
NA AFR
48 184
*1750-75 33 (68.8%) 22 (12.0%)
*1776-1800 15 (31.2%) 162 (88%)