Global silver trade from the 16th to 18th centuries American mining for the early part of the 16th Century. Mining in the Americas became formally industrialized when the process of mercury amalgamation became popularized. Mercury amalgamation was invented by a Spaniard in central Mexico in the 1550s. Historians dispute what individual was the first to invent the process, however most agree that it was a Spaniard. Mercury was the one of the highest costs of production for the Americas, since much of it had to be shipped. The ratio of Mercury to silver produced was about two to one. Furthermore, German miners introduced the stamp mill and lead smelting
Aztec warfare of payment received from the parents. Thus, sons of high nobility tended to succeed more often in war than those of lower nobility. Broadly, Aztec army ranks were similar to the modern Western rankings of “General” and "Major”, as were the groupings of warriors into categories such as “enlisted men” or “officers”. However, while parallels can be drawn between the organization of Aztec and Western military systems, as each developed from similar functional necessities, the differences between the two are far greater than the similarities. The members of the Aztec army had loyalties to many different people and institutions, and