- Invade Mexico. Give them an initial offer to officially become the 51st state of America. If they refuse, go in and take over. Declare it a state, eradicate the drug cartels, and embrace our new American brothers and sisters. End of border patrol problem. P.S. Stop trembling Canada, we're not interested. We've already got Shatner.
I'm no expert in geography, but I think even if we take over Mexico there still might be a border somewhere. It just may have moved. Then again not every country has borders.