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O teorie susţine că OK este abrevierea pentru “oll korect”, un termen din jargon apărut în anii 1830 care poate fi asemănat cu OMG-ul sau LOL-ul zilelor noastre. Cuvântul OK a apărut sub forma unei glume în 1839, în The Boston Morning Post, cel mai popular ziar din New England, la vremea aceea. Duminică, 23 martie, s-au împlinit 175 de la apariţie.
Al optulea preşedinte al SUA, Martin Van Buren, a fost cel care a popularizat cuvântul OK. Susţinătorii preşedintelui erau cunoscuţi sub numele de OK Club , OK fiind prescurtarea de la Old Kinderhook, porecla lui Van Buren. Unele surse au scris că Van Buren ar fi început să folosească OK drept semnătură.
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