Physical obstacles which are not supported by observation and direct fire, are just minor annoyances to an enemy.
There is no solution which does not involve the willingness for US forces to open fire on invaders.
“There is no solution which does not involve the willingness for US forces to open fire on invaders. “
Lawsuits. In our current culture it is impossible to kill people just to enforce the law...unless they’re Tea Partiers. But, if it were done just once, it would probably stop 90%. When I was in Mexico the Mexican government had put pamphlets in convenience stores that told how to cross the border and how to apply for aide. (This was just below the California border.) We are the Mexican government’s revolutionary safety valve. If there were no way to better themselves by leaving they would stay there and overthrow the government.