Americanisms emerged due to Noah Webster's advocacy for establishing an "American standard" of English in the late 18th century. His dictionaries introduced spellings and pronunciations that differed from British English. Throughout the 19th century, thousands of new American vocabulary words were coined from sources like Spanish and Native American languages. Today, Americanisms in vocabulary, grammar, and pronunciation like "math" instead of "maths" and "regular" instead of "medium" are increasingly used globally, raising questions about what constitutes "good" or "correct" English between countries.