Why was ho chi minh trail effective?

Answer 1

The Ho Chi Minh Trail was "Very" effective. But it wasn't a trail. It was a "Network" of roads and trails. If the US could have "widened" the war and involved Cambodia & Laos, the Ho Chi Minh could have easily been destroyed or occupied by US/Allied forces. Of course, then, possibly Red China and/or the Soviets would have had something to say about it. Red China DID enter the Korean War when US Forces invaded North Korea in 1950. So we simply bombed it, and conducted covert operations against it.

Answer 2

It was used as a supply route .