... does anyone know it's feasible to drive to Chile from the US armed with a US passport?
Minimim set of countries in between are:
Mexico, Guatemala, Honduras, Nicaragua, Costa Rica, Panama, Columbia, and Peru, with El Salvador and Ecuador as potential shortcuts along the way.
By feasible, I mean without encountering a border where they point you back the direction whence you came, having to visit visa hell before setting out, or getting waylaid along the way.
if anyone knows or has an idea.