First of all, the Spanish (along with the rest of the large European countries at the time) had guns and other military technology. With the advantage of having gunpowder, the Spanish were able to relatively easily conquer the indigenous peoples in the Americas. Another point is the Spanish military training; the American civilizations had no military training that matched the strict codes of the European countries, so the precision of the Spanish helped them conquer.
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Mutually Assured Destruction, or mutually assured deterrence (MAD), is a military theory that was developed to deter the use of nuclear weapons. ... To many, mutually assured destruction helped prevent the Cold War from turning hot; to others, it is the most ludicrous theory humanity ever put into full-scale practice.
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The machine gun, had been so refined that they changed the nature of warfare. Tanks and airplanes had a big impact on mechanized warfare, or warfare that relies on machines powered by gasoline and diesel engines.
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