The West's demographic collapse

Easy, cheap birth control pills:
Its simulates pregnancy and women lose desire to have children. Also, it fucks with hormones of other people - search "hormones in tap water" and transgender epidemic. Obv. transgenders don't reproduce.

Urban/suburban overcrowding:
Like that rat experiment when they gave rats everything iirc was called mouse utopia, overpopulation fucked their brains and they died off.
People also sense overpopulation and probably have the same reaction.

Purchasing power vs middle-class lifestyle:
People striving to live middle class lifestyle can't afford it anymore and prices of raising children are significant factor:
That, is affording their children middle-class lifestyle as a cultural obligation and planning for their future.

Multicultural society:
People don't have trust towards strangers and don't want to invest/support in the community. This makes its less safe to have/raise kids.
Loss of cultural cohesion and common religion also reduces trust.


Late-age births:
Associated with lots of mental defects and genetic abnormalities, these children are going to have a hard time reproducing and will have inferior genetic stock for their own children.

Carrying capacity - the ultimate limit:
Humanity can't handle exponential growth without new territory, and since Earth is inherently limited, there will be a population peak with gradual decline as resources are depleted. Space colonization might help if it was affordable to immigrate to some planet, but such planets have to be terraformed and settled with industrial system to support immigrants - a huge undertaking.

>>3

Their(3rd world) culture does not have:
1.Late-age births. They marry young.
2.Multicultural society. They self-segregate into ethnic enclaves.
3.
Purchasing power vs middle-class lifestyle. They don't have the cultural obligation to be middle-class for their kids.
4.Urban/suburban overcrowding. They are used to live in overcrowded conditions and their society has adapted to higher density living.
5.Birth control is a novel concept to them and they have strong family-clan-tribe culture. Often religion forbids any birth control or abortion.

They will multiply until Carrying capacity starts becoming relevant.