China

China was the main enemy of the United States during the Great War. The president of China in 2073, and probably until 2077 was called Xin. It seems that in the 21st century, the Soviet Union lost its position of the dominant communist country to China. Curiously, the only mention of China being communist in any of the Fallout games is in the dialogue with Enclave President Dick Richardson, who calls the Chinese "damn Reds".