Maybe not yet, but it will be. The world is getting older as well. The US will find itself increasingly competing for young, working age immigrants with other

Maybe not yet, but it will be. The world is getting older as well. The US will find itself increasingly competing for young, working age immigrants with other western nations. People in the developing world will also have less incentive to immigrate as their nations become more and more developed (look at India - it's still a much poorer than the US, but that gap used to be a whole lot bigger).