The term "arms race" refers to a competition between two or more countries for military power. The term is often used in a very general sense to refer to any rise in a country's military spending or buildup by a group of nations. This build-competitive up's generally reflects an antagonistic relationship. Other fields have made use of the idea of an arms race. However, this chapter focuses solely on military armaments competitions. Arms races are discussed in this chapter, along with their causes and implications, numerous models, attempts to manage them, and a post-cold war scenario for increased arms races in the United States. Finally, there's a conclusion that discusses the future of the arms race issue and provides recommendations for how to deal with it.