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South Dakota is listed as the 40th US State.

South Dakota and North Dakota were admitted into the union at the same time. So that the order of signing the proclamations would be unknown, the proclamations were mixed up and South Dakota and North Dakota were admitted as the 39th and 40th states.

Since that time, North Dakota has been listed first alphabetically, as the 39th US state, and South Dakota listed as the 40th US State.

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13y ago

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