This chart shows just how much more the US spends on its military compared with every other country; in fact it spends almost as much as every other country added together. Never in history will a country have had such an overwhelming military superiority over all other countries. The question is whether that improves the security of the world or not? 

http://www.iiss.org/publications/military-balance/the-military-balance-2012/press-statement/figure-comparative-defence-statistics/

Nick