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This article incorporates public domain text: Robinson, Doane (1905). A Brief History of South Dakota. American Book Company. pp. 215–221. CorenSearchBot picked up copies of this text elsewhere on the Internet, because others have similarly copied public domain text on other sites. Per WP:PD, this article is not a copyright violation.

• Thanks for the notations accordingly! Crow ^Caw 19:11, 30 May 2015 (UTC) reply

Ten sources for hundreds of years of history? That means almost none of this can be verified. It also means any editor who wants to can remove what's here. So, consider this if you add to the timeline without a source to point to: your work will most likely be replaced in the future because there's nothing to indicate it's worth anything. Allreet ( talk)

The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:

• Crazy Horse Memorial 2010.jpg

Participate in the deletion discussion at the nomination page. — Community Tech bot ( talk) 01:08, 27 April 2023 (UTC) reply