The Southwest border has broken open in recent weeks, with non-Mexicans — and illegal immigrant children in particular — crossing at a record rate in October, according to Border Patrol statistics that suggest the administration’s victory lap earlier this year was premature.Nearly 5,000 unaccompanied children were caught in October, and nearly 3,000 more had been caught in the first half of November — a record pace for those months — and it signals just how closely smuggling cartels and would-be illegal immigrants themselves are paying attention to lax enforcement in the U.S.Worse yet, the increases are borderwide, with every one...