This is the third and final volume in a series examining the southern anchor of the American alliance network in the Pacific—the ANZUS alliance linking the United States with Australia and New Zealand. This volume considers the policies of the three partners toward the region in which their defense alliance operates and the implications of trends in these policy areas for the future of their relationship. The work analyzes trends in three policy areas—regional security, the Pacific Islands, and regional economic cooperation—each of which provides a distinct window on the relationship. The dynamic Asia-Pacific region is of growing importance to each of the ANZUS states, and the approaches of the three to regional cooperation can only become increasingly important.