Chinese and North Korean troops invade South Korea: the United States intervenes at the request of the UN. 1.5 million dead: 33,629 Americans, 58,809 South Koreans, and 95,772 UN personnel (including Americans and South Koreans), 214,000 North Koreans, 404,401 reported Chinese deaths (probably many more), and 500,000 wounded. Cost: $340 billion.
