The Korean War is a Timeline Event that can occur from 1951 to 1953.
While the event is happening, the price of all military buildings is halved as military hardware becomes a lot cheaper to purchase to prepare for a conflict.
After Japan lost World War 2, Korea was given to the allies, with the USSR taking the north half and the US taking the south half. Both worked to establish independent governments, making North Korea communist and South Korea capitalist. Unfortunately, the leaders of both Korean governments were also nationalists who wanted to reunify the country under their own system, sparking the conflict. Although a ceasefire agreement was signed, both halves of Korea are still officially in a state of war.