The United States and Jordan have maintained a valuable mutually-supportive relationship for decades as a result of shared interests in a moderate, prosperous, and stable Middle East. In this monograph, the author highlights Jordan's ongoing value as a U.S. ally and considers ways that the U.S.-Jordanian alliance might be used to contain and minimize problems of concern to both countries. Although Jordan is not a large country, it is an important geographical crossroads within the Middle East and has been deeply involved in many of the most important events in the region's modern history. In recent years, the importance of the U.S.-Jordanian relationship has increased, and Jordan has emerged as a vital U.S. ally in the efforts to stabilize Iraq and also resist violent extremism and terrorism throughout the region. Amman's traditional role in helping to train friendly Arab military, police, and intelligence forces to its own high standards is a particularly helpful way in which Jordan can enhance efforts to achieve regional security. The United States needs to support efforts to continue and expand this role. Additionally, Jordan maintains a key interest in Palestinian/Israeli issues and has made ongoing efforts to play a constructive role in this setting. Helping Jordan survive, prosper, and modernize correspondingly has become an urgent priority for the United States in its quest for a secure Middle East.