https://www.history.com/news/civil-war-causes-issues
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Battle of Gettysburg by Edwin Forbes (Library of Congress)
https://www.slurrp.com/article/how-salt-played-a-crucial-role-in-the-american-civil-war-1672997101901
https://www.ydr.com/story/opinion/2022/12/22/york-county-civil-war-mystery-likely-solved/69750512007/
https://www.stripes.com/branches/army/2022-12-20/civil-war-grant-promotion-8484908.html