Final answer:
Coronado reported to the Spanish king that his expedition did not find the promised gold, leading to his bankruptcy.
Step-by-step explanation:
Francisco Vásquez de Coronado reported to the Spanish king about his expedition that, although they explored a significant amount of territory, including present-day New Mexico, they did not find the fabled cities of gold. Instead, the expedition led Coronado into bankruptcy due to the costs associated with the extensive search, which yielded no precious metals. The Spanish conquest for gold and wealth during the period inspired numerous expeditions, but Coronado's journey is notably famous for its lack of economic success despite the vastness of lands explored.