North America is a continent located on Earth, and is connected to the South American continent. The three main countries located in North America are Canada, the United States of America, and Mexico.
The computer banks aboard Federation starships have maps of the North American continent stored in their systems, so they can be used as an instructional tool for visiting aliens who want to learn more about Earth. In 2254, the Talosians observed these maps when they were searching through the library computer aboard the USS Enterprise. ("TOS")