I'm so happy I can give you a lesson in history. America had fewer citizens 10 years before the slave were freed. America had fewer citizens 10 years before women were allowed to vote. America had fewer citizens 10 years before the draft was eliminated. Let me know if any of the logic is escaping you and I will elaborate.
BTW, why stop at one billion, why not two, three or infinity?
One billion was an educated guess based on my knowledge of undeveloped land and America's resources and infrastructure. I think 2 billion would be too many and infinity is just damn stupid. I could turn it around and say if 280 billion people in the US is too many why not just limit it to neverdem, but that would be crazy.
No one would argue that slavery was a good thing, or that women should not have the right to vote. However good the elimination of those previous wrongs were, they have enabled populists and socialists to enact their agenda as well as promote reverse discrimination.
America had fewer citizens 10 years before the draft was eliminated.
Eliminating the draft was politically expedient. I doubt that the eventual benefit for the military was more than a remote consideration. They probably expected a lower overall level of intelligence in recruits, and initially that's what happened. If I remember correctly they lowered the standards for enlistment in the Armed Forces in the remainder of the 1970s.
If you don't believe as a general proposition that more laws restrict freedom, there isn't any purpose in continuing this discussion.