I believe that it would be steam.
The Spanish were looking for gold. This is part of the 3 systems, these were things people came to the new world for. It was GOD GOLD AND GLORY, But the Spanish came for Gold
• The Mongol Empire had established a philosophy arranged on a mission to bond the whole world in one realm.• The Mongol army was better systematized and disciplined than the militaries of its rivals.• The Mongols made up for their small numbers by joining huge numbers of dominated peoples into their military forces.• The Mongols quickly developed Chinese methods and technology of blockade warfare, which permitted them to dazed the intricate defenses of walled cities.• Mongol forces were real in part because of their increasing standing for a cruel brutality and absolute destructiveness. Their status served as a practice of psychological conflict.• The Mongols showed a remarkable ability to muster both the human and material assets of their growing domain over census taking, an operational system of transmit stations for quick communication, and the early stages of a central bureaucracy in the center of Karakorum.• The Mongols nurtured commerce.• The Mongols drew on oppressed peoples to fill optional and lower-level governmental positions.• The Mongols greeted and maintained many religious customs as long as they did not become the attention of political disagreement.
