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Defense spending is the most controversial of them all. For example, the majority of the American taxpayers remain opposed to spending the tax revenue on reckless invasions of third world nations, such as Iraq and Libya.
The money spent invading Iraq could have bought cheap housing for 90% of America's homeless, and still be money left over to feed 10 million hungry people in the 3rd world for 10 years. Pulled those numbers out of my ass but they are probably close.