South Dakota Codified Laws
Chapter 45C - Uniform Sales And Use Tax Administration Act
Section 10-45C-6 - Cooperating sovereigns.

10-45C-6. Cooperating sovereigns.
The agreement authorized by this chapter is an accord among individual cooperating sovereigns in furtherance of their governmental functions. The agreement provides a mechanism among the member states to establish and maintain a cooperative, simplified system for the application and administration of sales and use taxes under the duly adopted law of each member state.

Source: SL 2002, ch 64, §6.