Everyone is going to want to reach for their favorite modern problem, but every point in history is fraught with sociopolitical and economic challenges. Today is not special, in that regard. My personal favorite reason is just that this is the outcome of birth control. At no other point in history could people decide how many kids they want, and when you give people the choice, they just aren't going to choose very m…
Birth control was available to the Baby Boomers's parents, and the result was... a baby boom. My two grandmothers had 7 and 5 children respectively in spite of the availability of birth control.
Cultural shifts, in this case due to the availability of birth control, take time to materialize.