Final answer:
Bridges and roads were essential for the Incan Empire's communication, military mobilization, and transport of goods due to its varied geography. A sophisticated network of roads ensured efficient administration and connection among different regions, with relay stations providing support along the way.
Step-by-step explanation:
Bridges and roads were crucial to the Incan Empire because it included a diverse range of environments such as mountain ranges, canyons, deserts, and narrow valleys. The Inca developed a technologically sophisticated road and bridge system to aid in travel and communication across their vast empire. At its peak, the road network spanned about twenty-five thousand miles, with paths ranging from straight passages on flat lands to winding paths and staircases around mountains. These allowed for movement of the Inca armies and transportation of goods to imperial storehouses. There were also numerous bridges made of different materials such as rope, stone, and wood to ensure connectivity across canyons.
Local administration played a role in the empire's stability, with governors and auditors ensuring adherence to Cuzco's demands while respecting local autonomy and traditions. The road network, which was an impressive construction feat, facilitated essential activities such as the swift movement of adminstrators and the Chasqui, or relay runners, enabling efficient communication and military mobilization. Regularly spaced relay stations ensured that travelers had access to resources throughout their journey.