Life is not a zero sum game. Although we haven’t experienced it lately, and economy grows through many deals that benefit both parties.
As to what Donald Trump will give up to build the wall, he has already said that endangered species will likely be inconvienced to build the wall. So Americans will have to give up putting animals in front of people.
We have already given up so much that it is hard to recognize how much. Donald Trump is offering to lead a movement of the People to correct this and restore the country to its founding principals.
Now, you obviously don’t think that things can get better. You are probably correct, but some of us would at least like to try.
What is the size of the fauna expected to need to pass the Trump wall? Chipmunks, squirrels, and raccoons no problem, anything bigger and it would have to be guarded.