In the last 70 years the population of the U.S. has roughly doubled. When do you think the government should get serious about immigration, when we have a population of almost 600,000,000 in 2075, at our current rate of population growth since the 1930s, or do you think we need to hit one billion?
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I spent nearly 5 minutes trying to find a map of undeveloped land in the USA, but I failed. I'm pretty sure I posted it for you in the past neverdem. The US has lots and lots of land and resources. I do not know what our optimum population is but we are no where near it today. As mankind improves the way it uses resources the optimum population will increase further. 1 Billion sounds about right for the amount of land and resources we have today. In 50 years as new technologies increase energy production and construction capabilities that number may double. I hope this answers your question.