South Dakota & North Dakota both entered the Union #OTD 1889.

South Dakota & North Dakota both entered the Union #OTD 1889. North Dakota is considered the 39th state and South Dakota the 40th, but no one knows which Pres. Benjamin Harrison signed off on first, so admission is based on alphabetical order. https://t.co/CzWRqhhhx0 pic.twitter.com/MivsO01V2O

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