Perry help the United States expand its influence in Asia as he negotiated the first treaty between the United States and Japan (Kanagawa Treaty).
The Kanagawa Treaty was signed on March 31, 1854 between Commodore Matthew Perry of the United States and the authorities of Japan, in the Japanese port of Shimoda. This treaty ended with 251 years of Japan's isolation and, at the same time, with its policy of exclusion (Sakoku), thus opening the Japanese ports of Shimoda and Hakodate to trade with the United States, guaranteeing the safety of American shipwrecks and establishing a permanent consul.
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B. the notion that communism could spread to neighboring states through close contact
Explanation:
during the cold War, the domino theory was that if one state would fall into communism, the rest would follow.
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American neutrality
The president insisted that all government actions be neutral, and that the belligerents must respect that neutrality according to the norms of international law.
The Americans helped the British Empire, French and Portuguese forces defeat and turn back the powerful final German offensive, also the Americans played a role in the Allied final offensive
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In 1939, Germany and the Soviet Union secretly invade Poland.