evidence: The Venezuelan Boundary Dispute officially began in 1841, when the Venezuelan Government protested alleged British encroachment on Venezuelan territory. In 1814, Great Britain had acquired British Guiana (now Guyana) by treaty with the Netherlands. Because the treaty did not define a western boundary, the British commissioned Robert Schomburgk, a surveyor and naturalist, to delineate that boundary. His 1835 survey resulted in what came to be known as the Schomburgk Line, a boundary that effectively claimed an additional 30,000 square miles for Guiana. In 1841 Venezuela disputed the British delineation, claiming territorial delineations established at the time of their independence from Spain. Venezuela claimed its borders extended as far east as the Essequibo Riveran effective claim on two-thirds of British Guianas territory. When gold was discovered in the disputed territory, Great Britain sought to further extend its reach, claiming an additional 33,000 square miles west of the Schomburgk Line, an area where gold had been discovered. In 1876 Venezuela protested, broke diplomatic relations with Great Britain, and appealed to the United States for assistance, citing the Monroe Doctrine as justification for U.S. involvement.