You might mean their political
structures. One thing in common with the Aztecs and the Incas is that both
employ a governing system somewhat similar to a federal style of government.
Aztecs, whose empire included several distinct cultures, ruled indirectly by simply
asking tributes. The Inca empire have four administrative regions called suyu,
which was effectively ruled by an Apu, which has no connection to the royal
family ruling the Inca capital Cuzco.
First off, what country/nation is the question based on?
I will go ahead and give you a generalized answer that could apply for any country/nation:
In the past, it was important for the military to guard is gold reserves and mines so that other "enemies" couldn't just go walk in an steal their gold from their mines or reserves. And pretty much the same applies with trade routes, and also so people couldn't go hijacking their trade routes and steal goods from the people travelling the route.
