Final answer:
The end of the Ming Dynasty's voyages was marked by the burning of the Chinese fleet and the restriction of foreign travel. This strict isolation was driven by a spirit of isolationism in the Chinese court. The construction of the Great Wall of China also took place during this period.
Step-by-step explanation:
The strict isolation by the Ming Dynasty at the end of their voyages is evidenced by the burning of the Chinese fleet and the restriction of foreign travel.
This decision was influenced by a spirit of isolationism in the Chinese court under Zhu Zanji.
The Ming Dynasty also turned its attention to border defenses and the construction of the Great Wall of China alongside the restriction of foreign trade.