The U.S. blockade of Venezuela to prevent sanctioned tankers from shipping oil to and from the South American country is not the only geopolitical game involving the United States in its backyard in the Western Hemisphere. U.S. lawmakers are not happy with Mexico sending fuel shipments to Cuba. Power outages and massive blackouts have become more frequent on the Communist-run island since shipments from sanctioned Venezuela dwindled and left Cuba’s petroleum-dependent power system at the mercy of alternative supplies. Some…