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ObaOblationObsidianOcampo, Melchor (1814-1861)Occam, WilliamOdysseyOffice of Economic Opportunity (OEO)Office of Price Administration (OPA)Office of Scientific Research and DevelopmentOidorOklahoma City BombingOld KingdomOld regime/old orderOld StockOld TestamentOligarchyOlive Branch PetitionOlmecOmaha PlatformOn the Donation of Constantine One Hundred Slain, Battle of Oneida CommunityOPEC Oil Embargo of 1973Open DoorOpen fieldsOpen ShopOperation OVERLORDOperation TORCHOptimates “best men”Oracle BonesOrdealOrder of the Heroes of AmericaOrders in CouncilOrders/estatesOrdinance of 1784Oregon TrailOrganic EvolutionOrganization of American States (OAS)Organization of Petroleum Exporting Countries (OPEC)OrthodoxOrthodox ChristianityOrthodoxyOrthopraxyOsirusOstend ManifestoOstracismOtto IOur Lady of GuadalupeOutremerOvidOwens, Jesse