The Boston Globe - April 3, 2015  
Joseph S. Nye, Harvard University Distinguished Service Professor
Since World War II, 
the United States has been the most powerful state in world politics. 
Many analysts view a rising China as the most likely contender to end 
the American century. One recent book is even entitled "When China Rules
 the World."
Most projections of Chinese power are based on the rapid growth rate 
of its GDP, and China may pass the United States in total economic size 
in the 2020s. But even then, it will be decades before it equals America
 in per capita income (a measure of the sophistication of an economy). 
China also has other significant power resources. In terms of basic 
resources, its territory is equal to that of the United States and its 
population is four times greater. It has the world's largest army, more 
than 250 nuclear weapons, and modern capabilities in space and 
cyberspace. In soft power (the ability to get what you want through 
attraction rather than payment or coercion), China still lacks cultural 
industries able to compete with Hollywood; its universities are not top 
ranked; and it lacks the many non-governmental organizations that 
generate much of America's soft or attractive power.
In the 1990s, I wrote that the rapid rise of China might cause the 
type of conflict predicted by Thucydides when he attributed the 
disastrous Peloponnesian War in ancient Greece to the rise in the power 
of Athens and the fear it created in Sparta. Today, I think that is 
unlikely, though some analysts flatly assert that China cannot rise 
peacefully. Many draw analogies to World War I, when Germany had 
surpassed Britain in industrial power. But we should also recall 
Thucydides' other warning, that belief in the inevitability of conflict 
can become one of its main causes. Each side, believing it will end up 
at war with the other, makes reasonable military preparations which then
 are read by the other side as confirmation of its worst fears.
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