With conditions deteriorating between the United States and China, a military presence in Alaska was established to prevent a possible invasion across the Bering Strait. With increasingly scarce oil reserves, a last deep-sea deposit below the Pacific Ocean was claimed by China before allegedly being sabotaged by American special operatives. Strained relationships spiraled downward into conflict as China marched on Alaska, and the Sino-American War of 2066–2077 erupted. Under the command of General Jingwei, the Chinese Army usurped control of Alaska's oil pipeline and reserves. In response, the Americans began what came to be called the "Anchorage Reclamation Operation" (2067–2077).
Under the leadership of General Constantine Chase, the U.S. Army battled fiercely to the front lines of the conflict before Chase began deploying specialized power armor units that began pushing the Chinese back. Future power armor suits were further refined as the conflict dragged on, and the Trans-Alaska Pipeline was reclaimed. With resources flowing through Canada, strained diplomatic tensions between Canada and the United States becoming problematic, and when Canadian forces began attacking the pipeline, the country was annexed.
A combination of inclement weather, constant American bombardment, trench warfare and U.S. Powered Armor unit attacks sweeping through mainland China, the Chinese supply lines weakened and finally broke down completely. By the beginning of 2077, the city of Anchorage was finally liberated, the Chinese eradicated, and the operation deemed a success. A commemorative memorial was erected in Washington, D.C., in honor of the soldiers who fought and perished for the greater American good. Violence between America and pockets of Canadian freedom fighters continued throughout 2077, until the Great War obliterated almost all infrastructure, commerce and human life.