Usually, and especially colloquially, the term “Americans” is related to the citizens of the United States of America (USA), which is considered to be mightiest nation of the world since World War II. However, to be more precise, one has to distinguish between North America, South America and Central America.
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Resources:
America Facts, information, pictures | Encyclopedia.com articles about America. Web. 9 Jan. 2014. http://www.encyclopedia.com/topic/America.aspx#1.
Image:http://2.bp.blogspot.com/-EkcBHrtB2xQ/TupAvkFIw1I/AAAAAAAADGw/1TwMBgYD6Ys/s1600/America-map.jpg (22.01.2014).