Cuba has reconnected its power grid and brought its largest oil-fired power plant back online, ending a nationwide blackout that lasted over 29 hours, officials said.Nearly ten million people were left in darkness overnight due to the blackout. Cuba's power grid was reported to be fully online around 6:11 PM local time on Tuesday. However, government officials warned that energy shortages could persist as electricity generation remains insufficient.Electricity generation was affected after the United States halted oil supplies to Cuba. The energy crisis in Cuba deepened as the US blocked oil shipments from Venezuela to the island nation.Cuban President Miguel...