Alaska

Alaska was the 49th state in the United States of America. It, unlike most states, was detached from the US mainland. Instead, it was a separate piece of territory bordering Canada.

Pre-war
Before the war, the world went through a phase called the Resource Wars in which the remaining oil wells of the world ran dry, and the price of oil had increased significantly. As the price of oil rose around the world and the oil wells grew dryer, the Alaskan oil wells remained operational. The US government knew that this would make Alaska a target, so they established a front line around the city of Anchorage.

Eventually, China attacked Alaska and broke through the lines, seizing Alaska and decimating US forces in the area, taking the oil. The US counterattacked the Chinese forces using power armor and military robots, but they eventually invaded mainland China.

The Chinese were eventually pushed back at the Battle of Anchorage when the US Army unveiled their new T-51 power armor. This also helped the fight in mainland China.