Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 311 at the 2000 census. It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to Mount Rushmore National Memorial, which is located just beyond city limits. Among its tourist attractions is the Black Hills Central Railroad, built in 1900 for Black Hills gold. It now operates passenger trains pulled by preserved steam locomotives. Carrie Ingalls spent a significant part of her adult life here, living with her husband David N. Swanzey and his children. Her sister Mary Ingalls lived with them for a while and died here in 1928.

What is international law?

Private International law (or conflict of laws) is a set of rules of procedural law which determine which legal system and the law of which jurisdiction apply to a given legal dispute. They typically apply when a legal dispute has a foreign element such as a contract agreed by parties located in different countries. Private International Law attorneys represent clients in legal disputes involving citizens and businesses in other countries.

Attorneys who practice Public International Law handle cases involving legal and practical relationships between nations -- including issues like agreements and treaties between nations, international trade regulation, and human rights.