DISCLAIMER: VERY LONG (BORING FOR SOME) AND DETAILED ANSWER: By now, you must have got from the other answers that USA i.e. United States of America is part of North America. The reason why it is named so has a very interesting history. read more
USA is a part of North America continent. It is basically a federation of 50 states ,united together as a one country,hence it's name “United states of America”. Other major countries apart from USA in North America continent are Canada and Mexico. read more
North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the earth's land area and about 4.8% of its total surface. North America is the third largest continent by area, following Asia and Africa, and the fourth by population after Asia, Africa, and Europe. read more