A Guide to the United States’ History of Recognition, Diplomatic, and Consular Relations, by Country, since 1776: Guyana
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.
U.S. Recognition of Guyanan Independence, 1966.
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.