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This is because both Puerto Rico and the Virgin Islands were unincorporated territories of the United States with the U.S president as head of State. There was no need to patrol Puerto Rico and the Virgin Islands as the U.S blockade was against Cuba, not against the two U.S territories.
These people did invade China, but their raids were not successful.
Answer: What was the biggest effect of the European Exploration in the New World on the Native.
Explanation:trade routes to lucrative Asian markets and hoped to gain global recognition for their country.