Alright so this isn't happening to me but I'm curious what my options are if it does? Can I ghost the girl and leave town? How far is the US government reach as far as forcing me to pay child support?

I figure this is the best place to ask since I have been googling and all I get is female oriented websites

Edit: since many of you pointed it out I don't mind if the options are illigal. I do realize legally I'm fucked but I'm not above moving to Argentina or something crazy I just want to hear any options no matter how crazy