Not the same thing as deciding where a lawsuit must be filed, a choice of law provision is a contract clause that says which state's or country's law will govern disputes tied to that agreement. A common mix-up is with a forum selection clause: one picks the legal rules that apply, while the other picks the court or location. The clause may cover the whole contract or only certain issues, such as interpretation, performance, or available remedies.

In practice, that choice can shape the outcome of a dispute in a very real way. Different states handle breach of contract, damages, statutes of limitation, and defenses differently. In an injury-related claim connected to a contract - such as a transportation, construction, or insurance dispute - the chosen law can affect who may be held responsible, what losses can be recovered, and how fault is evaluated.

For South Dakota claims, the issue can matter when a contract points to another state's law even though the event happened locally, such as during spring flooding near the Missouri River or Big Sioux River that disrupts performance or contributes to an accident. If South Dakota law applies, fault questions may be influenced by the state's modified comparative fault rule under South Dakota Codified Laws § 20-9-2, which uses a slight-versus-gross contribution standard and bars recovery when the injured party's fault reaches the legal cutoff.