In how many mainland South American nations is English the official language?

Guyana is a country on the northern mainland of South America, bordered by the Atlantic Ocean to the north, Brazil to the south and southwest, Venezuela to the west, and Suriname to the east. With 215,000 square kilometres (83,000 square miles), Guyana is the third-smallest sovereign state by area in mainland South America after Uruguay and Suriname. With an estimated population of just 743,700 it is the second-least populous sovereign state in South America after Suriname.

There are nine indigenous tribes residing in Guyana: the Wai Wai, Macushi, Patamona, Lokono, Kalina, Wapishana, Pemon, Akawaio and Warao. Historically dominated by the Lokono and Kalina tribes, Guyana was colonised by the Dutch before coming under British control in the late 18th century. It was governed as British Guiana, with a mostly plantation-style economy until the 1950s. It gained independence in 1966, and officially became a republic within the Commonwealth of Nations in 1970. The legacy of British rule is reflected in the country's political administration and diverse population, which includes Indian, African, Amerindian, Chinese, Portuguese, other European, and various multiracial groups.

Guyana is the only South American nation in which English is the official language. The majority of the population speak Guyanese Creole, an English-based creole language, as a first language. Guyana is considered part of the Anglophone Caribbean.