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The title says it all. I mean we have all heard the massive invasion of the North etc. But what could the US realistically done differently. And this is not about the right or the wrong of the war. Purely about what other options the US could of used. Personally I think establishing a fortified line from the South China Sea to the Loatian-Thai border was one. The Trail was vital to the NV war effort. Air power couldn't cut it but what if it was cut physically?