Obama cannot erase the 10th Amendment
Texas and Mexico share 1,254 miles of common border and are
joined by 28 international bridges and border crossings. This
number includes two dams, one hand-drawn ferry, and 25 other
crossings that allow commercial, vehicular and pedestrian
traffic.
https://www.txdot.gov/projects/projects-studies/statewide/texas-mexico-border-crossings.html
Other info/data at the link above.