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Does it mean that a more rich country has to conduct more wars? Or that it is more likely to be invaded?

Military expenditures by country in 2010:

http://upload.wikimedia.org/wikipedia/en/timeline/9b6b4ac6234a38d7f61757290055617d.png

I wonder does the US Department of Defense deserve "defense" in...

I think these pictures were translated from another language version.