there are no short lived, targeted, and concealable ways to sterilize humans that is also scalable. most diseases that cause sterility, are also very prone to spreading, so you get unwanted collateral damage. physical intervention in the form of spaying isn't feasible, because each intervention would be a few hundred dollars, even if you cut corners and accept high mortality rates. it would also be extremely obvious, and very unpopular. you would basically need a tailor made gene plague, and hope that it doesn't jump to other hominids species. which is science fiction at best, you'd run the very real risk of it jumping to humans, and everyone winding up sterilized. cutting foreign aid to them, and systematically attacking them economically is the most practical way to do it, but that would require the western world to actually be in control of their governments. but we are currently under an occupational government who uses us as a colony, and they don't give a shit how many jeets flood the world, they're just more gdp slave units to them.
United States