There are 6 states touching South Dakota. None of them are closest. The states are:
North Dakota
Minnesota
Iowa
Nebraska
Wyoming
Montana
North Dakota and South Dakota
North Dakota and South Dakota
South Carolina and South Dakota.
The two states named both north and south are North Dakota and South Dakota. These states are located in the northern central region of the United States and were admitted to the Union in 1889. North Dakota is known for its prairies and Badlands, while South Dakota is famous for Mount Rushmore and the Black Hills.
North Dakota and South Dakota
Two states border the eastern end of South Dakota- Minnesota and Iowa
It was the Enabling Act of 1889.
North Dakota and South Dakota North Carolina and South Carolina
North Dakota & South Dakota are located between Nebraska and Canada.
North Dakota, South Dakota
South Dakota was part of the Dakota Territory. The Dakota Territory existed from March 2, 1861, until November 2, 1889 when what was left of the Dakota Territory was split into the two states of North Dakota and South Dakota.
In 1889, two states entered the Union: North Dakota and South Dakota. They were admitted on November 2, 1889. These two states were the 39th and 40th states to join the United States.