I have read clash of civilizations. Most important point to take out of it is that we reside in the remnant of the Greeks/Romans, and how this worldview is directly contradictory to Islam and most of the world.
Much of what we take for granted today comes from them.
My point is that the West is already killing people, one in three to maintain the status quo. This is exactly what abortion does, point and kill one out of the next three people that you see.
As for numerical progression, what’s the average growth rate of the United States? Precisely how many years would it take to reach 1 Billion Americans?
122 years at 1 percent average growth rate per year. That’s slightly on the generous side. At 0.95 percent growth, which is slightly low, it would take 130 years. So in 2150 you’d see an America with one billion people.
Of course, that assumes that the rate does not change over time which is rather unlikely.