original: United States admission day (1889) of North Dakota and South Dakota as 39th and 40th states.
simplifications: The United States admitted North Dakota and South Dakota as the 39th and 40th states in 1889. United States added North Dakota and South Dakota as 39th and 40th states in 1889. North and South Dakota were formed in 1889 as the 39th and 40 states. United States admission day (1889) of North Dakota and South Dakota. They became the 39th and 40th states. North Dakota and South Dakota became the 39th and 40th states in the United States admission day of 1889. North Dakota and South Dakota became the 39th and 40th states in 1889. U.S. admission day (1889) of North Dakota and South Dakota as states 39 and 40. 1889 is when the United States accepted North Dakota and South Dakota as 39th and 40th states. United States Admission day of 1889 established North Dakota and South Dakota as the 39th and 40th states respectively. North Dakota and South Dakota were admitted as 39th and 40th states on United States admission day in 1889.