Texas border city on edge as Gov. Abbott dials up battle with Biden

A century and a half ago, Confederate Gen. Joseph Orville Shelby splashed into the wild waters of the Rio Grande off this border city and fled to Mexico, refusing to surrender to Union soldiers.

Now the park named in his honor has become a front line in a feud between the state and the federal government — a power struggle over who ultimately has the right to control the border and the tide of humanity trying to cross it.

Texas National Guard Humvees carry rifle-toting troops and patrol newly erected gates...