Final answer:
The Spanish built a road between Santa Fe and Mexico City to establish direct communication and transportation, facilitate trade and colonization, and maintain control over the newly conquered territory.
Step-by-step explanation:
The Spanish built a road between Santa Fe and Mexico City for several reasons. One reason was to establish a direct route for communication and transportation between the Spanish capital in Mexico City and the capital of the Kingdom of New Mexico in Santa Fe.
The road allowed for the movement of goods, resources, and people, facilitating trade and colonization efforts. Additionally, the Spanish wanted to maintain control and exert their influence over the newly conquered territory.