"For all the noise and head generated by the 1840 campaign, its most lasting legacy may have been one of the shortest words in the English language. In the spring of 1839, the phrase "OK" began to circulate in Boston as shorthand for "oll korrect", a slangy way of saying "all right." Early in 1840, Van Buren's supporters began to use the trendy expression as a way to identify their candidate, whom they labored to present as "Old Kinderhook," perhaps in imitation of Jackson's Old Hickory. Van Buren even wrote "OK" next to his signature. It spread like wildfire, and to this day it is a universal symbol of something elemental in the American character- informality, optimism, efficiency, call it what you will. It is spoken seven times a day by the average citizen, two billion utterances overall. And, of course, it goes well beyond our borders; if there is a single sound America has contributed to the esperanto of global communication, this is it. It is audible everywhere- in a taxicab in Paris, in a cafe in Instanbul, in the languid early seconds of the Beatles' "Revolution," when John Lennon steps up to the microphone and arrestingly calls the meeting to order. There are worse legacies that a defeated presidential candidate could claim."
January 1, 1970
https://en.wikiquote.org/wiki/Martin_Van_Buren