Improved relations with the Soviet Union and the PRC are often cited as the most successful diplomatic achievements of Nixon's presidency. ... The reason for opening up China was for the U.S. to gain more leverage over relations with the Soviet Union. Resolving the Vietnam War was a particularly important factor.
Answer: It led to new towns and more trade. It allowed China to conquer new territory.
Explanation:
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.
D. Clay Tablets would be the correct answer.