It is zero sum. How is it not? This is not an investment. It is not going to create future tax revenue for the US. It is just keeping people barely alive in crippling poverty for a little bit longer than they would otherwise.
IMO it is an investment and it will bring future revenue to the US. Because this fosters working relationship with other countries, countries that we ultimately rely on for their resources. Because they have a working relationship with the US, they're willing to give us some pretty sweet deals.
If you look at Africa, it has the most wealth by resources out of any continent. It's also the poorest continent nominally. We're getting a lot of good stuff at INSANE discounts.
What I'm describing is, of course, colonialist in nature. The US is an empire, not a nation. But, the hope is that as we help those countries develop they can help us stay developed, and we can eventually reach some mutually beneficial equilibrium. Instead of exploitation.
But, currently, the relationship is exploitative. It's a bit wild to me that you legitimately think the US, of all countries, is being exploited. No bubba... no. We do the exploiting. Everything you own is build with layers and layers of global exploitation built into it. You have a few hundred slaves working for you as we speak.