I guess it's time yet again to reiterate that there is a very crucial distinction between legal and illegal immigration. Any rational person knows this, of course. They also know, if they simply look at the facts, that the US is anything but "overcrowded." Finally, anyone with even the slightest measurable brain activity knows that one does not make up their own list of 'conclusions' (pulled from the darkest recesses of the digestive tract) and then expect anyone else to accept them as some sort of legitimate point of reference.
We cannot feed or house or employ all of our own.
That means that we already have more than we can handle.
That means that we are overcrowded.
No need to wait until we're packed into the place like sardines.
We have expanded as far as we can, east-to-west.
We have expanded all that we are going to expand, north-to-south.
We must now make-do with what we have, like everyone else.
That includes refraining from (a) over-breeding or (b) over-intaking, until we're all as miserable as those second- and third-world shitholes where so many of our immigrants hail from.
Illegal Immigration is poisonous to this country, as are its practitioners and byproducts.
Legal Immigration can continue to be accommodated at present quota-levels for a while still, but we should probably begin to consider throttling that back as well.
One hundred years ago, we still needed to (and could) accommodate large numbers of new arrivals.
That is no longer the case.
We have all we need - all the muscle and intellect that we could possibly need.
If we can't find what we need from amongst the 300,000,000+ within our own borders, there's a very good chance that it's not to be had, at any price, from any quarter.
We can always use a handful of Exceptional Folk who might want to come here, but we've just about reached the point where we're "Full-Up" and don't need New Arrivals any longer in the quantities which we once did.
Nothing wrong with that.
Nothing lasts forever.
Including the demand for new immigrants.
We may very well be a nation built on immigration, but that does not bind us nor condemn us to accept large-scale waves of immigrants forevermore, once we've had our fill.
Keep the numbers for Legal Immigration at present levels for a few more years.
Hold a serious and objective National Conversation regarding IF and WHEN and HOW we might want to begin scaling back on Legal Immigration, including what those cut-off threshholds might be, from a holistic, QUality-of-Life and Resource-Conservation perspective.
A conversation in which people of goodwill, from all ends of the opinion-spectrum, get to have their say, and have their opinions treated with respect and full consideration.
And then, if indicated and deemed desirable, pull-back on the throttle, or, at the very least, begin routine monitoring for those agreed-upon thresholds for triggering such a cut-off.
Having doubled our population - from 150,000,000 to 300,000,000 - in a mere half-century - and with the population rate skyrocketing even higher in some parts of the world from which we would be accepting additional immigrants...
Engaging the nation at-large in such matters, in a serious fashion, is the only sensible and responsible thing to do.