Wars have made great contributions to the development of the U.S. Because the U.S. has often been victorious, achieving the purpose of their war, most wars ended with a surrender of the enemy or declaration of termination. The Americans concluded peace treaties only when they wanted to fundamentally restructure the regional order after the war or to realize their strategic interest from a broader, longer perspective in some parts of the world. This research is to analyze the peace treaties that the U.S. has signed so far or has mediated upon, searching for the possibility of making a U.S.-DPRK peace treaty. In light of the U.S. practice, the U.S.-DPRK Peace Treaty will not only be an agreement to officially terminate the Korean War, but shall be a “magna carta” for peace which is the ultimate concern of people in the Korean peninsula as well as in Northeast Asia. Time is ripe for the Trump-administration to accept “peaceful” co-existence instead of “hostile” co-existence