The Pacific Islands region, also known as the South Pacific or Southwest Pacific, presents Congress with a diverse array of policy issues. It is a strategically important region with which the United States shares many interests with Australia and New Zealand. The region has attracted growing diplomatic and economic engagement from China, a potential competitor to the influence of the United States, Australia, and New Zealand. Congress plays key roles in approving and overseeing the administration of the Compacts of Free Association that govern U.S. relations with the Marshall Islands, Micronesia, and Palau. The United States has economic interests in the region, particularly fishing, and provides about $38 million annually in bilateral and regional foreign assistance, not including Compact grant assistance. This report provides background on the Pacific Islands region and discusses related issues for Congress. It discusses U.S. relations with Pacific Island countries as well as the influence of other powers in the region, including Australia, China, and other external actors. It includes sections on U.S. foreign assistance to the region, the Compacts of Free Association, and issues related to climate change, which has impacted many Pacific Island countries. The report does not focus on U.S. territories in the Pacific, such as Guam, the Northern Mariana Islands, and American Samoa. The Southwest Pacific includes 14 sovereign states with approximately 9 million people, including three countries in "free association" with the United States-the Marshall Islands, Micronesia, and Palau. New Caledonia, a territory of France, and Bougainville, which is part of Papua New Guinea (PNG), are to hold referenda on independence in 2018 and 2019. U.S. officials have emphasized the diplomatic and strategic importance of the Pacific Islands region to the United States, and some analysts have expressed concerns about the long-term strategic implications of China's growing engagement in the region. Other experts have argued that China's mostly diplomatic and economic inroads have not translated into significantly greater political influence over South Pacific countries, and that Australia remains the dominant power and provider of development assistance in the region. Major U.S. objectives and responsibilities in the Southwest Pacific include promoting sustainable economic development and good governance, administering the Compacts of Free Association, supporting regional organizations, helping to address the effects of climate change, and cooperating with Australia, New Zealand, and other major foreign aid donors. U.S. foreign assistance activities include regional environmental programs, military training, disaster assistance and preparedness, fisheries management, HIV/AIDS prevention, care, and treatment programs in Papua New Guinea, and strengthening democratic institutions in PNG, Fiji, and elsewhere. Other areas of U.S. concern and cooperation include illegal fishing and peacekeeping operations. Congressional interests include overseeing U.S. policies in the Southwest Pacific and helping to set the future course of U.S. policy in the region, approving the U.S.-Palau agreement to provide U.S. economic assistance through 2024, and funding and shaping ongoing foreign assistance efforts. The Obama Administration asserted that as part of its "rebalancing" to the Asia-Pacific region, it had increased its level of engagement in the region. Other observers contended that the rebalancing policy had not included a corresponding change in the level of attention paid to the Pacific Islands.