helped the Aztec farm more productive - chinampas
helped the Inca travel long distances and communicate with their neighbors - rope bridges
helped the Maya view astronomical phenomena such as eclipses with the naked eye - pyramaid at Chichen Itza
Hawkeye. who'd you choose?
The south was technically fighting a defensive war, they had more time to prepare so really any of these answers could be right, but id have to go with they had either more money or more effective military commanders
I believe True but I'm not 100% postive