What is the name of the system established to make sure that each branch of government can prevent the other branches from getting too much power?

The correct answer to this is: checks and balances.

The system of checks and balances is the system by which branches of government are limited by other branches. This ensures that no one branch becomes too powerful.

i really really really really really really dont know

either b) they were often feared and despised by other native cultures. or

c) their obsession allowed them to coexist with many other native cultures because of their peaceful nature.