LA is barely growing, much slower than the country as a whole. New York is treading water and losing relative population, as is most of the NE (only low tax NH is an exception). Nevada, Arizona (and not Phoenix incidentally, which is no more than the national average), Florida, Utah, Idaho, Texas, Colorado, North Carolina, and Delaware are the states gaining population significantly faster than the whole country - the first 6 by double digit rates in just the last 5 years, and Nevada in particular over 20% in that period.
You don't know anything about America, you are just another Malthusian fool stuck in failed 19th century thinking.