You're entitled to your opinion but there are other and frankly better ways to make money. Outsourcing manufacturing to be done via slave labor in China makes for cheap goods but it doesn't make for an industrial sector at home. There are ways to generate wealth that don't involve constant interventionism.
Maybe I'm not explaining myself very well, but what I mean is that the entire global system is predicated on American power, with or without military adventurism.
Withdrawing that power and suddenly expecting the world's economic structure to remain exactly as it was is very naive. Exceptionally cheap resource extraction from Africa, for instance, only works because of the internationally-backed sovereign debt system and foreign ownership of extractive processes. Oil from the Middle East depends upon Saudi cooperation, &c. &c. Withdraw that cooperation, as in '73, and you get standstill.
These are only two examples, but the pattern is repeated a thousandfold with the same answer - at bottom, what secures these processes and undergirds this structure is American power and global authority. The system
will fail with a collapse in that authority.
It's
already partially failing because the US can't enforce patent protection, and so it's getting out-competed by state actors that don't have to invest in costly R&D, merely industrial espionage. China got hit with import tariffs and simply finished their products in other countries to avoid them. How were they able to do that? Power; a failure of American power.
The whole system of international trade is indelibly reliable on American power and you simply don't have the option of withdrawing that. You can't pull the keystone out of the arch to to build something else, and just... pray that it doesn't collapse.
China, Russia, whoever...
they will forcibly close your markets, as China is doing with Belt and Road and increasingly in Australia and Eastern Europe even.
The only solution is to rebalance and strengthen NATO, if you want to have any chance of reducing your military spending while keeping the current system as intact as it is.