Explain one negative effect of contact between Native Americans and Europeans

When the Native American's and the Europeans met, the European's had new diseases on them that they carried from Europe on their ships. These diseases were new to the Native American's immune systems, so their bodies didn't know how to handle these new viruses and diseases, which caused many tribes and nations to die out completely.

Explanation:

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to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.