Okay, do you include procreation as one of the things to which you object?
I've read some of your issues with immigration, but your concerns don't automatically fit with international adoption. International adoption has more to do with population growth by procreation. Many parents adopt as an alternative to procreation, choosing to adopt a child already born rather than birthing one. Choosing between those two options has the same impact on the US population.
I don't think there's much room for you to critique these adoptions unless you're also willing to step up and say it should also be illegal to procreate.
What about American orphans?