The Negative Population Growth lobby understands this very well, and are confident they will achieve their goal of reducing U.S.population to 150 million or so in the medium to long term.
What they ignore is that 30 leading Muslim countries are currently growing by 1.9% a year and, if that continues, will make up half the population of the planet by 2085. It’s all right there in the numbers. And the main difference between their growth and our decline is that they don’t abort their children and we do. My guess is that our problems with Islamic terrorism have just begun. By 2050, they’ll have enough people to cross any border they want..