从地缘政治学看大国的兴衰（连载）□王恩涌／北京大学五、２０世纪美国的兴起与争霸在地缘政治学中，有人称２０世纪是美国世纪。其实，美国的经济实力进入２０世纪已牢居世界第一。在两次世界大战中，军事力量已起着重要作用，但其作为世界政治的主导作用还是从第二次世... The Rise and Fall of Great Powers Viewed from Geopolitics (Sequentially) □ Wang Enyong/Peking University The emergence and hegemony of the United States in the 20th and 20th centuries In geopolitics, some people claim that the 20th century is the American century. In fact, the economic strength of the United States has been ranked first in the world in the 20th century. In the two world wars, military forces have played an important role, but its leading role as a world politics is still from the second world...