They weren't - they were just less vulnerable to the European diseases. Native Americans had never encountered those diseases before, so they had no natural defenses against them.
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Europeans had previous exposure to many diseases like smallpox , and had immunities built up . Native Americans were decimated by these things.
Had no natural protection from diseases brought by Europeans.
One main reason that Native Americans were being so rapidly conquered was that the they had not built up any immunities to the diseases that the European settlers had brought with them. These diseases spread wildly and killed many native populations very quickly. Another factor was that most Native American tribes did not believe that land could be owned privately, as in their cultures they had always shared the land as a community resource.
Oh, dude, the native Americans didn't exactly have a gift shop of diseases to pass around to the Europeans. It was more like a unintentional exchange program where they unknowingly shared illnesses like smallpox, measles, and influenza. So, yeah, the Europeans got a few unexpected souvenirs from their travels.
Small pox. The natives had no resistence to diseases the europeans carried to the new world.
European exploration of the Americas had a devastating impact upon the Native population. Specifically, the Europeans brought diseases with them that the Native Americans had no immunity against. The Native population was ultimately reduced by 90 percent.