Latinos in once true-blue Texas border zone are getting on the Trump train

The Rio Grande valley's Tejano population was once reliably Democratic but traditional loyalties have been eroded

Anna Holcomb is preparing her Ram pickup truck for the big event on Saturday, festooning it in Make America Great Again (Maga) flags that flap restlessly in the searing hot Texas wind.

Holcomb is gearing up for a show of strength by Donald Trump supporters in the Rio Grande valley, the region of south Texas that flanks the Mexican border. From 8am on Saturday morning, thousands of similarly decked-out vehicles will form convoys along a 300-mile stretch, from Brownsville on the Gulf of Mexico all the way north to Eagle Pass.