Robin Abcarian: Repelled by tear gas and confusion, many migrants leave the caravan to return home

TIJUANA, Mexico - For hopeful migrants who traveled so many miles, the American border was supposed to be the beginning of a new life, not a return to the old one.

But the day after American authorities rained down tear gas on men, women and children who had tried to rush the border, the brutal reality hit home: America's fraying welcome mat has been replaced with coils of concertina wire.

For some migrants in the caravan, Sunday's spurt of violence, which seemed to have begun when a handful of migrants chucked rocks over the border fence, was too much. Hundreds, in resignation, decided Monday to take up the Mexican government's