If I recall, it was still being used in texts and such very casually (see Ten Little Niggers) even in the early 20^th Century.
hi! not discouraging other (scholarly) input, but FYI, this question has received several responses in the past:
How do slurs form and change over time? Specifically, how did "nigger" go from neutral, to derogatory, to being acceptable by certain speakers?
when was it first suggested black racial slurs like were offensive?
When did the N-word go from being a commonly used word to refer to those of African-American descent, to being a word only Black culture could use?
Antebellum Historians who have watched Django Unchained: can you discuss/clarify the use of the n-word in 1858 Mississippi?
When did the word "nigger" start being commonly (publicly?) referred to as the "n-word"?
At what point did 'Negro' become an unacceptable term for African-Americans?