Why does the United States spend more on the military than the rest of the entire world combined?

23% of the budget is spent on defense. Please explain this to me. What are we so afraid of? Are we a bunch of... show more 23% of the budget is spent on defense.

Please explain this to me.

What are we so afraid of?

Are we a bunch of sissies?

http://www.globalsecurity.org/military/world/spending.htm

http://www.globalissues.org/article/75/world-military-spending#WorldMilitarySpending

http://en.wikipedia.org/wiki/List_of_countries_by_military_expenditures
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