The Nuclear Arms Race In order to maintain peace and stability in the world, there must be a balance of power between countries. The Nuclear Arms Race was started because there wasn't a balance of power after World War II. The U.S. was the only country at that time which possessed nuclear weapons. Russia, fearing a United States domination of world power, developed a nuclear bomb of its own. Thus started the Arms Race, in which both countries attempted to gain the upper hand in terms of the number of nuclear warheads each possessed. However, the Arms Race ended when several treaties in arms reduction were passed. I believe that in the end,