Etymology
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americium (n.)

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

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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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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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RCA (n.)
1922, initialism (acronym) of Radio Corporation of America.
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Tupi (n.)
a native language group of South America, also Tupian.
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Carib (n.)
"one of a native people of Central America and northern South America and formerly of the Caribbean," 1550s, from Spanish Caribe, from Arawakan (West Indies) kalingo, karina, or kalino, said to mean "brave ones" or else "strong men." As an adjective by 1881.
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Americanism (n.)

1781, in reference to words or phrases used in North America and distinct from British use, coined by John Witherspoon, president of Princeton College, from American + -ism. (American English "English language as spoken in the United States" is first recorded 1806, in Webster.) Americanism in the sense "attachment to or preference for the U.S." is attested from 1797, first found in the writings of Thomas Jefferson.

I have been not a little disappointed, and made suspicious of my own judgment, on seeing the Edinburgh Reviews, the ablest critics of the age, set their faces against the introduction of new words into the English language; they are particularly apprehensive that the writers of the United States will adulterate it. Certainly so great growing a population, spread over such an extent of country, with such a variety of climates, of productions, of arts, must enlarge their language, to make it answer its purpose of expressing all ideas, the new as well as the old. [Jefferson to John Waldo, Aug. 16, 1813] 
Jefferson, as if disposed to assail the sovereignty of the English tongue as well as the sovereignty of the English sword, never hesitated to coin a word when it suited his purposes so to do; and though many of his brood are questionable on the ground of analogy and as intermixing languages; yet they were expressive, and became familiar. [Hugh Blair Grigsby, "The Virginia Convention of 1776," 1855]
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