South Dakota Codified Laws — Title 10 (Taxation)
SDCL § 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: official text