In general, most states with silver deposits have mountainous regions that are important to the development of these deposits over time, but this is not always the case. <span />
Federalists, i'm pretty sure that's your answer.
The Aztecs and Incas lacked
A. Political Unity: they didn't have a strong political government.
B. Disease. 70% or more natives were killed by the diseases the Europeans brought over
C. Technology: Europeans had more advanced technology than the natives
