International Affairs/Relations

International Affairs/Relations
Why did the US lose the war in Vietnam? Was it primarily a consequence of military or political failure?

exactly 1500 words excluding refrencing Please
And please do use the following Textbooks

W. C. McWilliams & H. Piotrowski, The World Since 1945, 7th edition, chapters 5 (pp. 118-125) & 9

A. H. Bernstein, ‘Vietnam: A Military-Post-Mortem’ in The National Interest, Vol. 10, Winter 1987-88

And any other Textbook in your possession that relates to the topic.