what is meaning of , because of their long isolation americas original inhabitants had no immunity against these dedly diseases that come from europe
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Answer:
Till 16th century Americas remained isolated from contact with rest of the world. Due to this the diseases which was common in the world was an pandemic in Americas. People except of Americas had developed vaccine and immunity against that disease in their bodies but the native Americans did not develop that. When they were discovered, the most powerful weapons that the invaders carried were the germs of diseases in their body which did not affect them but they affected the native American people. For e.g., After the discovery of Americas the first country to annex the Americas was the Spain. The Spanish invaders had the germs of small pox in their body. Which when introduced in the continent of Americas went deep without any people(Spanish) reaching their. Due to their loss of immunity against Smallpox, a large number of people were killed due to this.