Nearly $2B Targeted For Busiest Border Wall Section Goes Unused Nearly $2B Targeted For Busiest Border Wall Section Goes Unused A migrant family waits to be processed after being apprehended near the border between Mexico and the United States in Del Rio, Texas on May 16. (Sergio FLORES / AFP) Thousands of illegal immigrants enter the U.S. daily while much of $2 billion Congress set aside for a wall and technology in the busiest region of the southern border goes unspent, it was reported Friday. The Washington Examiner said 89 of the project's 110 miles remains unfinished, along the winding Rio Grande River that divides the U.S. and Mexico.