Mongols

Mongolia was a pre-War country in Asia.

Pre-War
Genghis Khan is mentioned in the Pioneer Scout archaeologist exam, along with the fact that his tomb was never discovered. Part of the Trans-Siberian Railroad, which passes through Mongolia, is also mentioned in the exam.

The region of Outer Mongolia declared its independence from the collapsing Manchu-led Qing dynasty in 1911, and the newly established Republic of China fought with Mongolia in an attempt to reincorporate it well into the 1920s. The country converted into the Mongolian People's Republic in 1924, a unitary sovereign socialist state with close ties to the Soviet Union.

Before the war, the Gobi Campaign took place in the Gobi Desert between the US Army and the People's Liberation Army. The desert spans the borders of both China and Mongolia. It is unknown if Mongolia, or parts of it, were annexed by China.

Post-War
The Khans and New Khans, raider groups originating from Vault 15 in New California in the post-War United States, base their culture on the history of the Mongol Empire and that of Genghis Khan.

The remnants of these groups rebranded as the Great Khans and settled in the Mojave Wasteland. A book about the history of the Mongol Empire can likewise be found there, entitled Pretty Pretty Horsies: A History of the Mongol Empire.

A band of raiders called the Huns lived in the area formerly known as Mongolia.

Appearances
Mongolia was to appear in Fallout Extreme, and is mentioned in Fallout, Fallout 2, Fallout: New Vegas, Fallout Shelter, and the Fallout Pen and Paper d20 intro.

Mongolia Mongolie Mongolia Mongólia Монголия Монголія