Supposedly the first Christian sermon in the Black Hills was preached at Custer City, South Dakota by Methodist layman Henry Weston Smith.
He would be murdered that following August.
While this was notable, I'm frankly really skeptical that this was the "first". American histories of the settlement of the West tend to pretend that when European Americans first shows up they were the first people of European ancestry to show up, which is very far from true. The Corps of Discovery, for instance, merely re-trod ground that the French Canadians had been hiking for years. Catholic missionaries had been in the region, moreover, for decades by this point.
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