Four Key Factors Behind Spain's Conquest of the Americas

  1. Advanced weaponry: Firearms, cannons, and steel‑hulled ships gave Spain a decisive military edge.
  2. Disease: Old World pathogens (smallpox, measles) devastated immunologically naïve Indigenous populations.
  3. Political divisions: Indigenous societies were fragmented; Spain exploited rivalries and formed alliances.
  4. Superior strategy & tactics: Spanish commanders applied European battlefield experience and flexible tactics.
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