The Dutch colonies of Essequibo, Demerara and Berbice, which compose what is now modern-day Guyana, were ceded to Great Britain at the Congress of Vienna and established as British Guyana in 1831.
Modern Flag of Guyana
The United States recognized Guyanan independence on May 26, 1966, with the establishment of the American Embassy at Georgetown. Guyana had been under British rule.
Diplomatic Relations and the American Embassy in Georgetown were established on May 26, 1966, with Delmar R. Carlson as Chargé d'Affaires ad interim.