It does not matter who is happier or have better life - middle class family in US or low-cast family in India. Sad fact is that ALL western societies are below replacement level. White US population is on decline (and it's not steep only because of conservative rural population). Depopulation is a bitch and nature hates void. Two kids are not replacement level - you need 2.33 kids on average.

Fertility rate for white female with college degree (liberal dream) is 1.6 in US. What it means? It means that it takes only 10 generations (180-250 years) to go from 150 million species to 15 million (10x reduction). That means that current model of liberal society just does not work from evolutional perspective. Being educated white female is a negative trait from evolutionary perspective.

I am saying this as somebody who has highly educated girlfriend and who is very unlikely to have more than two kids (one reason being that it takes 200k to send one kid to college).