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At the same time South Dakota became a state, North Dakota was also admitted into the union. 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 alphabetically listed first, as the 39th US state, and South Dakota listed as the 40th US State.

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13y ago

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