Matthew Iglesias touches all the bases in his Vox article “The Case for Immigration.”

“For those who believe in the principles of the Declaration of Independence and the value of America’s ideals, accepting a future of decline and retreat in the name of ethnic purity should be unacceptable. That the more homogeneous America will be not just smaller and weaker but also poorer on a per capita basis only underscores what folly it would be to embrace the narrow vision. That hundreds of millions of people around the world would like to move to our shores — and that America has a long tradition of assimilating foreigners and a political mythos and civil culture that is conducive to doing so — is an enormous source of national strength.

“It’s time we started to see it that way.”