The Pacific Campaign was a major theater of World War II that took place in the Pacific Ocean and its islands. It involved a series of battles between the Allied forces, primarily the United States, and the Empire of Japan. Key battles included the Battle of Midway and the Battle of Guadalcanal, which were crucial in turning the tide against Japan. The campaign aimed to reclaim territory occupied by Japan and to ultimately defeat Japanese forces. It involved significant naval and air operations, as well as ground assaults on various islands, leading to the eventual capture of strategic locations like Iwo Jima and Okinawa.