Origin of OK

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It is probably the most widely used single expression in human speech used billion times a day.Where does it come from?what are its origins?nobody seems to be certain about it except that it has come from the United States. Some say that therw was a political org. the OK Club formwd in 1840 to support the candidature of Martin Van Buren,the Eigth President of United States during his campaign for re election. the letters OK stood for Old Kinderhook,the small town in New York State where Van Buren was born