Answer:
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Trade; Before and after colonization, unlike the Europeans, you shared the land, no one truly owned it.
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The Mexican society wasn't united, since they were constantly fighting with each other. Since soldiers were killed, they also lost military power. When the Spanish arrived, they had a strong military, but also diseases, which killed Mexican soldiers. That made the home society vulnerable.
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The bubonic plague caused one third (1/3) of Europe's population to meet their painful demise.