With a good chunk of that money being allocated to getting young Americans killed (i.e. military spending).
How many Americans have been killed in the past 20 years during military operations? Approximately 10,000. If that's all the young American deaths we get for trillions of dollars in spending, that is not a great bang for your buck at all. Hell, more than twice that amount died in one day on September 17, 1862.
In case anyone is curious, this refers to "the bloodiest day in all of American history" https://en.wikipedia.org/wiki/Battle_of_Antietam where it appears fewer than 8,000 people died.
Also, you're forgetting all the money that flows directly back into your states, through infrastructure spending, federal services, federal share of funding state services, etc. (Which is a convoluted way of moving money from 'have' states into 'have-not' states.)