When the Incan civilization was described as the "greatest empire on earth," what aspect was being highlighted?

The description of the Incan civilization as the "greatest empire on earth" primarily highlights their vast size and influence. At its height, the Incan Empire stretched over a significant portion of western South America, encompassing modern-day Peru, Ecuador, Bolivia, and parts of Chile and Argentina. This geographic expanse allowed the Incas to control a diverse range of peoples and resources, establishing extensive trade networks and communication systems, such as the famous Inca road system.

The influence of the Incan Empire extended beyond mere territorial control; it also included their ability to integrate various cultures into their administration and governance, as well as their impact on agriculture, technology, and infrastructure. The vastness of their empire facilitated the spread of their architectural achievements, such as Machu Picchu, and their agricultural innovations, like terrace farming. This combination of size and widespread influence is what distinguishes the Incan civilization in historical contexts, underscoring why they were regarded as the greatest empire of their time.