Government officials and energy developers misjudged the difficulty of building huge clean energy projects in the United States, which has built very few of them.
Initial findings in an internal investigation suggest the child was not provided with proper care. The acting head of the agency said changes to procedures had been made.
New York Times photographers are documenting the experience on both sides of the border, from Tijuana on the West Coast to Matamoros near the Gulf of Mexico.
The authorities in Brownsville, Texas, said George Alvarez was behind the wheel and that they were still trying to determine whether the crash was deliberate.