From Atlas Obscura: How Do You Speak American? Mostly, Just Make Up Words.
Residents of the United States hung on to words that dropped out of British English: guess, gotten, cabin, junk, molasses. We also began using words lifted from native languages—maize, canoe. But, mostly, Americans would just make words up. Thomas Jefferson, who described himself as “a friend to neology,” created the word “belittle.” British writers despaired over it; he simply made up more.
And ever since, speaking American has meant enjoying the use of a whole vocabulary that originated here. We have stolen words from other languages, massaged them into new words, turned nouns into verbs and verbs into nouns, and smushed two words together to make new ones.
For starters, just think about some words we borrowed from Dutch and decided to keep: boss, cookie, stoop, scow, sleigh, snoop, waffle, poppycock, pit, when used to describe the seed of a stone fruit. Dumb might be Dutch, or it might be German, or it might be a bit of both, but it’s a uniquely American bit of English.[continue]