On January 1, 1999, The Euro was officially launched. The euro's mounting on european and world arena arena has been the most significan event in international monetary sistem as well as inetrnational relkatoions, since the collepa of the bretton wood sistem. certainly the euro will have a far- reaching influence on the us dollar and inetrnational monetary sistem european and wolrd ecnomic political and financial framework and on europe us relations (trnas-atlanticrelation) in particular from a mebium and long term point point of view the introduvction of euro will pose a grave chllenged to the us dollar and have significant impact on europe-usa relations mainlty as follow firstly euro will undermine the supermacy of the us dollar in the financial fileld and take over the mantle of one of the leading internationla reserve currince,revaling the us dollar. secondly, euro ushers in a breakthrough in the world trade framework which is being monopolized by us dollar the euro will come to be new world trade transaction unit thirdly euro will break the monopoly of the us dollar on international bon market. fourthly euro will nible at us vested interest derived from the us dollar and thus affect us economy directly hence,the us will by no mens sit by and watch the us dollar losing its supremacy and give up the position of the us dollar to the euro.