Overwhelming majority of worldwide military basis are American... sustaining worldwide imperialism is pretty expensive. Plus, gotta pay those military contractors that support your political campaigns with leftover cash... it's pretty simple actually
ANSWER:
1. So GOP can brag about spending 4 times more than the net cost of BBB & not make themselves look like idiots (to their cult) for bitching about the nat鈥檒 debt for months.
2. Achieve a false sense of peace thru strength in spending vastly more than any nation on earth