Final answer:
Hernan Cortes destroyed his ships to prevent his men from retreating and to show his determination to conquer the Aztec Empire.
Step-by-step explanation:
Hernan Cortes destroyed his own ships to ensure that his men would not have the option to retreat. By burning the ships, Cortes eliminated any possibility of his soldiers abandoning the mission and returning to Cuba. This bold move showed Cortes's commitment to conquering the Aztec Empire and claiming the land for Spain.