Common misconception. Conquistadors had hundreds of thousands of South American tribesmen as allies because the Aztecs had been slaughtering the neighboring tribes for centuries. Neighbors wanted seriousnpayback. Kinda ruins the libs portrayal of Pre-Columbus Americas as nirvana.
True. The marines know about that, and they won’t be short of allies against Rome.
Cortez - Mexico - Aztecs. Pizarro - Peru - Incas.
But in both cases the Spanish took advantage of bitter divisions among the natives to make their conquest, helped greatly by massive epidemics that disorganized the native empires.
Even with their stone age tech, it is highly unlikely the Spaniards could have conquered either Mexico or Peru if these empires had been united and healthy.
Bingo!
Victor Davis Hanson’s Carnage And Culture covers that fairly well.