Traditional metal working in Mexico one in silver, which represented the sun and moon respectively. The existence of gold and silver in Mexico was one of the main attractions for the Spanish in the New World, with the conquest of the Aztec Empire and subsequent exploration with the aim of finding more of these precious metals. Mining and metal working became a main aspect of the economy of colonial Mexico. Most of the emphasis was on the mining of gold, silver, copper, iron, lead, platinum and tin with much of the metal, especially gold, shipped to Spain. Initially, the working of metals in the new
What Is History? that events could not have happened differently unless there was a different cause. He called “these so called accounts in history represent a sequence of cause and effect interrupting and so to speak clashing with the Sequence of which the historian is primarily concerned to investigate.” He feels that the main job of a historian is to investigate the reasons/causes as to why events occurred and not to create the events or justify them. He was not a fan of "what if" history and he found it pointless because it did not happen. Carr saw accidents in history as impossible