No, we need those benefits for the whole of humanity.
Much of humanity depends on the US. You save the US, you save the world.
Oh, Please. Don't put the US on a pedestal. There is a shitload of issues that the US needs to fix and a little humility in accepting that others have better solutions, is one of them.
For all of the US's problems, Pax Americana has been statistically pretty damn successful.
The internal issues of the US are of no concern to other nations, the only thing they care about is what the US can do for them and the rest of the world.
Fix the immigration system
We don't necessarily need to do that. We just need less anti-intellectualism and to reduce the power/influence of the religious right in the US.
People were generally much more religious and conservative in the 1950s/60s than they are today no? How many Black astronauts were in the Apollo program?