Answer:
establishing a sea connection linking La Bahía at Matagroda Bay to Veracruz
Explanation:
Marqués de San Miguel de Aguayo was a Spanish nobleman who was famously known for establishing a connection by sea which linked La Bahia to Veracruz.
He was a governor of Coahuila and Texas provinces who was later honored to the highest position of Field Marshal by the Spanish King in 1724.