original: united states admission day -lrb- 1889 -rrb- of north dakota and south dakota as 39th and 40th states .
simplifications: north and south dakota became the 39th and 40th states in 1889 . united states admission day -lrb- 1889 -rrb- of north dakota and south dakota as 39th and 40th states . north dakota and south dakota were admitted as the 39th and 40th states in 1889 . united states admission day of north dakota and south dakota as 39th and 40th states . north and south dakota were admired as the 39th and 40th states to the us in 1889 . in 1889 , the united states admitted north and south dakota as the 39th and 40th states . in 1889 , north dakota and south dakota were admitted as the 39th and 40th states . united states admitted north dakota and south dakota as 39th and 40th states .