A century-old territorial dispute deepened by the discovery of oil is boiling over between neighbors Guyana and Venezuela. Steeped in patriotism, the Venezuelan government is seizing on the fight to boost support ahead of a presidential election among a population fed up with a decadelong crisis that has pushed many into poverty.
Venezuelans on Sunday approved a referendum to claim sovereignty over Essequibo, a mineral-rich territory that accounts for two-thirds of Guyana and lies…