Ok (or okay) is a distinctly american term. what is its supposed origin?

A more likely explanation is that the term originated as an abbreviation of orl korrekt , a jokey misspelling of 'all correct' which was current in the US in the 1830s. The oldest written referencesresult from its use as a slogan by the Democratic party during the American Presidential election of 1840. Their candidate, President Martin Van Buren, was nicknamed 'Old Kinderhook' (after his birthplace in New York State), and his supporters formed the 'OK Club'. This undoubtedly helped to popularizethe term (though it did not get President Van Buren re-elected).

A, this way you know that there’s a less of a chance of it having biased information or edited by other people-making false information