evidence: Venezuelans hold as self-evident truth that their homeland’s eastern end includes Guyana’s Essequibo region next to the Atlantic — a territory larger than Greece and rich in oil and minerals. As students, they learn it is subject to a century-old dispute and then, for the most part, forget about it. [...] Most of Guyana’s foreign investment is in the 61,600-square-mile (159,500-square-kilometer) area, which accounts for two-thirds of its territory. Yet, Venezuela has considered Essequibo as its own since gaining independence from Spain in 1811, and it disputes the border decided by international arbitrators in 1899 when Guyana was still a British colony. [...] Guyana’s people believe Essequibo is theirs and see no legal issue in the matter, said Cummings, who has written about the dispute and grew up in Guyana, four miles from the border with Venezuela.