text: why did the the us have to fight in vietnam?   win or lose doesn't matter.... it was to maintain their super power status during that era. united states needed war before and united states need war in every 15 years. look into the history of modern wars... study how many wars happens in the mordern wars has us involvements, can you observe that most of the wars was actually created by us intelligence? its an accounting theory. war creates economy to us when the dollar value drops.