Which best describes why American Indian groups were vulnerable to European diseases? They lacked the necessary vaccinations
They were unfamiliar with all diseases
They failed to take preventative measures
They lacked immunity to these diseases

Its D

Explanation: Native peoples of America had no immunity to the diseases that European explorers and colonists brought with them. Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians. Europeans were used to these diseases, but Indian people had no resistance to them.

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