What factor allowed the Incas to use their military efficiently?
they developed an extensive system of paved stone roads
they created a unique record-keeping system for military campaigns
they adopted Spanish military technology and
used them against their enemies
they used rivers to transport their troops
they developed an extensive system of paved stone roads
they created a unique record-keeping system for military campaigns
they adopted Spanish military technology and
used them against their enemies
they used rivers to transport their troops