And that counts as an explosion? I consider that hyperbole, but whatever. OK, let's examine that growth in more detail:
[qimg]http://flatrock.org.nz/static/frontpage/assets/money_politics_law/boom1.jpg[/qimg]
Which 5-year age bracket has the most people in it, dc? Is it the 0-4 bracket?
No, it is not. It's the 50-54 age bracket. We have never had a 5-year span with more children born than 1956-1960, the period that cohort was born. But when they were born, there were fewer older people than younger people, so even with a constant total birth rate, the population will continue to increase until that cohort reaches their end of life, at which point the population would stabilize (again, if the total birth rate remained constant, and it's close to that), if we ignore immigration. But in fact, the total birth rate has NOT been constant. It's gone down. So absent immigration, we're actually facing a population decrease in the very near future.
Ever since 1960, our population growth has been driven by a change in our demographic structure (more old people) plus immigration. The demographic structure changes can only drive population growth over about 1 lifetime (and we're reaching towards the end of that). Beyond that, it's going to be only immigration-driven.
But our policies on insurance coverage of contraception doesn't affect immigration. So your position still makes no sense.