HOUSTON — Gov. Greg Abbott of Texas said on Wednesday that days of snarled traffic on the border, caused by new safety inspections he ordered last week, were part of a concerted effort to force Mexican officials to do more to stop the flow of migrants into the United States.Ratcheting up the stakes in a clash over immigration that has tangled trade routes into Texas, Mr. Abbott said he would end the inspections only at one entry point — the bridge between Laredo and the Mexican city of Colombia, Nuevo León — and only because the governor of that state had agreed to increase border security on the Mexican side.The Te …
