KAthy,
after my timne there I was not cooked. I was more like Boiled from the heat and moisture (rain). When we weren't trying to get cooled down we were sent to another location to go fight some more NVA regulars. Then we did not have time to think about freaking hot and humid it was...
YES you can stop them. You simply put a standing army there at the border armed to the teeth.
Lined up in firing position and battle formation. In plain sight for all those cute little MS 13 pussies to see.
Nothing like the glint of steel in the morning sun to send a chill down one's back.... They likely would think about going home after realizing they are not crossing that border except in a body bag...