Don't let Trump know I suggested this but if Mexico were the 52nd state then they would be US citizens and could pick up the labor market. We just need to build more railroads.
Plenty of labor and resources.
No real borders to patrol/fence, except one with Colombia. An interstate commerce bonanza.
[1] - https://www.youtube.com/watch?v=9TPG80boMjY [video][3 mins][humor]
Does the US really have a shortage of people willing to work at factories? Honest question.