Assuming this 175 miles is built , how many more miles of wall are needed?
California/Mexico border is 137 miles
New Mexico/Mexico border is 210 miles
Arizona/Mexico border is 389 miles
Texas/Mexico border is 1259 miles
Total length of US/Mexico border is 1954 miles.
Unsure precisely how much of this new bollard type wall has been installed. Some 18 feet. Some 30 feet.
That is, the largest concentration of illegal immigrants, cross in a relatively few areas (San Diego, Yuma, parts of the Rio Grande) where there is already good access *from* the South.
The more of those areas that are blocked, the more two things happen:
1) Fewer people cross in areas that are harder and harder to get to.
2) The Border Patrol isn't stretched so thin, and has more manpower for the areas that are left.