John Rhodehamel gives this presentation on white supremacy and Lincoln’s assassins at the 2022 Lincoln Forum.
The video’s description reads, “Author John Rhodehamel argued that John Wilkes Booth’s primary motivation for assassinating Lincoln was white supremacy, acting in response to the President’s commitment to emancipation and racial equality. The Lincoln Forum in Gettysburg, Pennsylvania, hosted this event.”
https://www.c-span.org/video/?524209-6/2022-lincoln-forum-white-supremacy-lincoln-assassination
Student of the American Civil War 
Interesting video. May have to check out his book in the near the future.