<prompt> Translate the following text to EnglishKifungu cha amani kilikuwa katika uamuzi wa Nixon wa kuondoa madai yake kwamba Ho Chi Minh aondoke Vietnam Kusini - madai ambayo angeweza kuachana nayo miaka minne mapema, akiondoa maisha ya Wamarekani 18,000.  <response>: The key to peace lay in Nixons decision to jettison his demand that Ho Chi Minh withdraw from South Vietnam--a demand that he could have renounced four years earlier, sparing 18,000 American lives. 