Answer :
The NVA would have penetrated into Laos anyway, and spread the war with them; probably knowing full well that the United States would do the same. The NVA didn't care; for them it was do or die. Captured NVA pith helmets were found with their own graffiti written on them; "Born in the North, died in the South." There was no way the North could have survived continuing the war by travelling through the sea, along the coastline; the USN would have sunk every craft that tried. There was no way the North would have tried to cross the DMZ...that was a channelized kill zone; they knew it, we knew it. That left Laos...and that couldn't be channeled & Laos couldn't be sunk. The NVA could get lost in that country, and nobody could find them; they knew it, so did we. So, Laos was the place. (: good luck and hope i helped