With conditions deteriorating between the U.S. 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 Chinese forces marched into Alaska, officially starting the Sino-American War. Under the command of General Jingwei, the Chinese Army usurped control of Alaska's oil pipelines and reserves.
Under the leadership of General Constantine Chase, the U.S. Army battled fiercely at 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 became problematic, and when Canadian forces began attacking the pipeline, the country was forcibly annexed.
A combination of inclement weather, constant American bombardment, trench warfare and U.S. power armor unit attacking mainland China, the Chinese supply lines were severely weakened. By January 2077, the city of Anchorage was finally liberated and the Chinese presence was removed. A commemorative memorial was erected in Washington, D.C., in honor of the soldiers who fought and perished for the US. Violence between America and pockets of Canadian freedom fighters continued throughout 2077, up until the Great War.