Well, IDK ... My paternal grandfather arrived in America at the age of 10 in 1911 from Czarist Russia. He slept on this cousin's floor in a New York City tenement with other newly arrived relatives.
But there was future space -- in Forest Hills, Queens NYC and a summer home in North Miami Beach then a retirement home on 9 lots on Biscaya Island, Surfside, Florida.
There is space left in the USA and many other places on this planet. From what I have seen the population density in many places is extreme. But people create these densities for commercial reasons -- then have to live in the messes they make.
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