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

Question

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

anonymous · Answer

The First one, The Inca civilization went down hill relatively quickly due to the civil wars and after the arrival of Pizarro.

kingofhou · Answer

The correct answer is 'they developed an extensive system of paved stone roads.'