The USA is the fourth largest country in the world, in terms of area, and the third largest country, in terms of population. There are 50 states covering an area of 4 million square miles with a population of more than 281 million. The density of population greatly varies, depending on where you are in the country.
The US is the world's foremost economic and military power. It is also a major source of entertainment: American TV, Hollywood films, jazz, blues, rock and rap music are primary ingredients in global popular culture.
Choosing the right American visa is an important part of the American migration process. Still one of the most popular immigration destinations in the world, the US also has a complicated visa system and a vast array of visa categories.