Recruitment by the railroad companies
The Mexican society wasn't united, since they were constantly fighting with each other. Since soldiers were killed, they also lost military power. When the Spanish arrived, they had a strong military, but also diseases, which killed Mexican soldiers. That made the home society vulnerable.
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I believe the correct answer would be that the Incan army traveled through canals.
Hope it helps!
Wait I don’t know the answer to this but good luck In’Shaa’Allah
