| Year |
Date |
Event |
| 1907 |
|
The Qing government implemented sinification policies. |
| 1911 |
1 December |
Outer Mongolia declared independence from the Qing Dynasty under the Bogd Khan. |
| 29 December |
The Bogdo Khanate of Mongolia was proclaimed and Bogd Khan enthroned. |
| 1912 |
3 November |
The Russian Empire recognized Mongolian independence and the rule of Bogd Khan. |
| 1913 |
11 November |
Mongolia and Tibet concluded treaty on mutual recognition and mutual assistance. |
| 1915 |
|
Russia, China and Mongolia signed a treaty at Kyakhta under which China was recognized as sovereign over an autonomous Mongolia. |
| 1919 |
|
Outer Mongolia was occupied by the Republic of China. |
| 1921 |
|
The Russian Red Army, with the support of Damdin Sükhbaatar, defeated the forces of Roman Ungern von Sternberg. |
| February |
Ungern drove Chinese troops out of Niislel Khuree. |
| March |
All remaining Chinese troops were defeated by Ungern and driven from Mongolia, allowing the reassertion of Mongolian independence under Bogd Khan. |
| 18 March |
Communist guerrillas headed by Damdin Sükhbaatar, with the assistance of Red Army troops, defeated the Chinese garrison in the Mongolian settlement Maimachen near Kyakhta. |
| 1924 |
26 November |
After the death of the Bogd Khan, the Mongolian People's Republic was declared in Outer Mongolia. |
| 1928 |
|
Collectivization began. |
| 1932 |
|
The failure of collectivization led to widespread uprisings and a temporary thaw. |
| 1936 |
|
Prince Demchugdongrub formed the Mongol Military Government, a non-Communist state independent from China, in Inner Mongolia. |
| 1937 |
|
The Mongol Military Government was renamed the Mongol United Autonomous Government. |
|
Stalinist purges in Mongolia: A Stalinist terror began which would lead to the deaths of more than thirty thousand people in the Mongolian People's Republic. |
| 1939 |
|
Stalinist purges in Mongolia: The terror ended. |
| May |
Battle of Khalkhyn Gol: Large scale fighting took place between Japanese and joint Soviet-Mongolian forces along Khalkhyn Gol on the border between Mongolia and Manchuria. |
| 16 September |
Battle of Khalkhyn Gol: The battle ended in a Japanese defeat. A truce was negotiated between Japan and the Soviet Union. |
| 1941 |
|
The Mongol United Autonomous Government was renamed the Mongolian Autonomous Federation, or Mengjiang. |
| 1945 |
August |
The Republic of China requested Soviet help in the war against Japan, and offered recognition of the independence of Outer Mongolia in exchange according to the Sino-Soviet Treaty of Friendship and Alliance. |
| August |
The Mongolian People's Republic declared war on Japan, one day after the Soviet Union, and began to occupy Inner Mongolia which was then controlled by the pro-Japanese Mengjiang regime. |
| October |
A plebiscite yielded a 100% pro-independence vote. |
| 1946 |
January |
The Chinese government recognized the independence of Mongolian People's Republic. |
| 1949 |
6 October |
The newly established People's Republic of China recognized Mongolia and agreed to establish diplomatic relations. |
| 1950 |
|
Herds were successfully collectivized. |
| 1952 |
|
The Republic of China (ROC) on Taiwan renounced the Sino-Soviet Treaty of Friendship and Alliance. |
| 1955 |
|
The ROC blocked the accession of the Mongolian People's Republic's entry to the United Nations. |
| 1961 |
|
The Mongolian People's Republic entered the United Nations. |
|
The Trans-Mongolian Railway was finished. |
| 1962 |
|
Mongolia became a member of the Comecon. |
|
Sino-Soviet split: The Communist Party leadership sided with the Soviet Union in a falling-out with China. |
| 1965 |
|
Yumjaagiin Tsedenbal purged the intelligentsia. |
| 1969 |
|
Sino-Soviet split: The Soviet Union stationed a large army on Mongolian territory in response to threats of Chinese aggression. |
| 1981 |
March |
Zhugderdemidiyn Gurragcha became the first Mongolian in space. |
| 1984 |
August |
Tsedenbal resigned. |
| 1987 |
27 January |
Mongolia established diplomatic relations with the United States. |
| 1989 |
July |
The first Mongolian member of the Bahá'í Faith entered the country. |
| December |
The first popular reform demonstrations took place; the Mongolian Democratic Association was organized. |
| 1990 |
January |
Large-scale pro-democracy demonstrations were held in sub-zero weather. |
| 2 March |
Mongolia and the Soviet Union announced that all Soviet troops would be withdrawn from Mongolia by 1992. |
| May |
The constitution was amended to provide for a multi-party system and new elections. |
| 29 July |
The first democratic elections were held. The Communist Party, now the Mongolian People's Revolutionary Party (MPRP), won. |
| 3 September |
The first democratically elected People's Great Hural took office. |
| 1992 |
13 January |
A new constitution went into effect. |
| 8 April |
A new election law was passed. |
| 28 June |
An election was held for the first unicameral legislature, the State Great Hural. The MPRP won. |
| 1993 |
6 June |
The first direct presidential election took place. Opposition candidate Punsalmaagiin Ochirbat, a former MPRP member, won. |
| 1996 |
30 June |
The first non-Communist government was elected. |
| 1998 |
|
Sanjaasürengiin Zorig, Minister of Infrastructure and one of the leaders of the 1990 protests, was murdered. |
| 2000 |
2 July |
The MPRP was elected; a new government was formed by Prime Minister Nambaryn Enkhbayar. |