From the leftist perspective... white men were illegal immigrants on Indian land. From that perspective, I guess you could make the leap that illegal immigration made us stronger. However, letting the natives retake the land isn’t likely to lead to greater innovation.
My coworkers think that because “the land was stolen from the Indians,” we have to let in everybody now.
SO...because of something that happened over 200 years ago, this will NEVER be our country. We can never decide who comes in. We must be swamped by whatever millions want to flood in here, forever, and have no say.