Art Source International has amassed a collection of authentic antique maps and images brilliantly highlighting and detailing The United States, which borders Canada, the Pacific and Atlantic Oceans, Mexico, and includes five major territories: American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands. The top three most populous cities of the country in order are New York City, New York, Los Angeles, California, and Chicago, Illinois. The country has 423 National Parks. The United States became a country with the issuance of the Declaration of Independence from Britain on July 4, 1776. Art Source International reproductions and vintage maps can be ordered framed or without a frame.