The Organisation of Eastern Caribbean States (OECS) is an International Inter-governmental Organisation dedicated to regional integration in the Eastern Caribbean. The Organisation of Eastern Caribbean States came into being on June 18th 1981, when seven Eastern Caribbean countries signed a treaty agreeing to cooperate and promote unity and solidarity among the Members. The Treaty became known as the Treaty of Basseterre, named in honour of the capital city of St. Kitts and Nevis where it was signed.