Once a state achieves regional hegemony, it has a further aim: to prevent other great powers from dominating their geographical regions. In other words, no regional hegemon wants a peer competitor. The main reason is that regional hegemons—because they are so dominant in their neighborhood—are free to roam around the globe and interfere in other regions of the world. This situation implies that regional hegemons are likely to try to cause trouble in each other’s backyard. Thus, any state that achieves regional hegemony will want to make sure that no other great power achieves a similar position, freeing that counterpart to roam into its neighborhood.