Etymology
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America 

1507, "the western hemisphere, North and South America," in Cartographer Martin Waldseemüller's treatise "Cosmographiae Introductio," from Modern Latin Americanus, after Amerigo Vespucci (1454-1512) who made two trips to the New World as a navigator and claimed to have discovered it. His published works put forward the idea that it was a new continent, and he was first to call it Novus Mundus "New World." Amerigo is more easily Latinized than Vespucci (Latin Vesputius, which might have yielded place-name Vesputia). The sense in English naturally was restricted toward the British colonies, then the United States.

The man's name Amerigo is Germanic, said to derive from Gothic Amalrich, literally "work-ruler." The Old English form of the name has come down as surnames Emmerich, Emery, etc. The Italian fem. form merged into Amelia.

Colloquial pronunciation "Ameri-kay," not uncommon 19c., goes back to at least 1643 and a poem that rhymed the word with away. Amerika "U.S. society viewed as racist, fascist, oppressive, etc." is attested from 1969; the spelling is German but may also suggest the KKK.

It is a thousand pities that the puny witticisms of a few professional objectors should have the power to prevent, even for a year, the adoption of a name for our country. At present we have, clearly, none. There should be no hesitation about "Appalachia." In the first place, it is distinctive. "America" is not, and can never be made so. We may legislate as much as we please, and assume for our country whatever name we think right — but to use it will be no name, to any purpose for which a name is needed, unless we can take it away from the regions which employ it at present. South America is "America," and will insist upon remaining so. [Edgar Allan Poe, "Marginalia," in Graham's Magazine, Philadelphia, December 1846]
FREDONIA, FREDONIAN, FREDE, FREDISH, &c. &c. These extraordinary words, which have been deservedly ridiculed here as well as in England, were proposed sometime ago, and countenanced by two or three individuals, as names for the territory and people of the United States. The general term American is now commonly understood (at least in all places where the English language is spoken,) to mean an inhabitant of the United States; and is so employed, except where unusual precision of language is required. [John Pickering, "A Vocabulary, or Collection of Words and Phrases Which Have Been Supposed to be Peculiar to the United States of America," Boston, 1816]
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Americo- 
word-forming element used since late 18c. as "of or about America."
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americium (n.)

artificial radioactive element, 1946, from America + metallic element ending -ium.

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Latin America 
1862; see Latin (adj.). The notion is the nations whose languages descend from Latin. Related: Latin American (adj.), 1871.
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American (n.)
1570s, originally "one of the aboriginal peoples discovered in the Western Hemisphere by Europeans," from Modern Latin Americanus, from America (q.v.). The original sense is now Native Americans; the sense of "resident of North America of European (originally British) descent" is from 1765.
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Mesoamerica (n.)

also Meso-America, cultural or economic region comprising central and southern Mexico and northern Central America, by 1948, from Spanish Mesoamérica (by 1943); see meso- "middle" + America. Related: Mesoamerican.

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Appalachia 
"cultural and geographical region of inland Eastern U.S.," 1880s, from the Appalachian Mountains, which are its core. Earlier Appalachia was proposed as a better name for "United States of America" by Washington Irving in 1839 (though he preferred Alleghenia) and this may have been the coinage of the word (see America).
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American (adj.)

1590s, "pertaining to the Western Hemisphere and its aboriginal inhabitants," from Modern Latin Americanus, from America (q.v.); the sense of "pertaining to the residents of North America of European (originally British) descent" is first recorded 1640s; later "pertaining to the United States." French Américain, Spanish and Italian Americano, German Amerikanisch. Fem. form Americaness attested from 1838. The American beauty rose so called from 1886. American English as a sub-language attested from 1806; Amerenglish is from 1974.

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Anglo-American (n.)
"English person who has settled in North America," 1738, from Anglo- + American. Originally often in contrast to German immigrants; later (1830s) in contrast to French-Canadians, Louisiana French, Spanish Mexicans. As an adjective from 1797, "pertaining to the English who have settled in America;" meaning "pertaining to both England and the United States" is from 1812.
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peccary (n.)

indigenous pig-like animal of South America, Central America, and the U.S. Southwest, 1610s, from Spanish vaquira, baquira, from Carib (Guiana or Venezuela) pakira, paquira.

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