Why Men Don't Want To Have Children Anymore

Financial is definitely the main factor. You need to have a sense of security before you can feel confident to have a family. With the pandemic and inflation, this eats away at the security and rising rent costs makes it harder to afford housing. It is made worse by the fact that maternity leave isn't mandated in the US, so women put their jobs at risk for having children and a one income household already creates a lot of problems in the modern era. You also have things like unstable gig work or little to no job security. It takes much longer for people to achieve that level of security where they are comfortable to even have a permanent partner much less kids.

I would say another major factor is that people are trying to marry out of love rather than necessity in the modern age too. People are more picky with their partners compared to the past where someone would fix two people together out of economic or political reasons and you'd be stuck with it.