Itâs estimated that up to 7,000 different languages are spoken around the world. 90% of these languages are used by less than 100,000 people. Over a million people converse in 150-200 languages and 46 languages have just a single speaker! Languages are grouped into families that share a common ancestry.
All U.S. citizens are considered to be U.S. nationals, but not all nationals are citizens: natives of American Samoa and Swainâs Island (AS) are not U.S. citizens but are nationals. Select Eligible noncitizen if you are not a U.S. citizen (or U.S. national) and you are one of the following:
America I suppose is relating more to the continent (North America/South America). The USA is part of North America, but people just call the USA 'America' for short. So if someone says they're going to America, or that they live in America, they're probably referring to the USA, not the continent.