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This was the Mongol conquest of Jin China, leading to the occupation of land to the north and to the east (Heilongjiang and Liaoning, and parts of Inner Mongolia in real life)
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This is desirable when Jin and Song eventually unite, as this is the capital of the Jin Dynasty but also a city Southern Song consider to be their 'true capital'.
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Jin-Song and the Mongols make a treaty, allowing the latter to keep land north of the Shanhai Pass, but stopping them from conquering any more.
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After the end of the sixth invasion in 1257, Korea agrees to become the Mongols’ vassal in exchange for the withdrawal of troops from Central Korea and its autonomy. It stops being one with the fall of the Mongol Empire.
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Now that the Mongol Empire is collapsing, Wén retakes control of the Peninsula of Liaodong. This angers the pro-Mongol General Choe, as the peninsula was previously part of Goguryeo. He demands the invasion of this land, but the pro-Wén General Yi (later Taejo of Joseon) defies him and assasinates him in 1388, starting a coup.
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King U is overthrown, signalling the end of the Goryeo dynasty and the start of Joseon. This allows Wén to maintain control of the Bohai coast.
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Wén sends an envoy to Korea after its first anniversary. The former had supported General Yi’s coup against the Goryeo dynasty due to his being pro-Wén, while Goryeo is pro-Mongol. Relations between the two dynasties begin to emerge.
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Wén conquers Taiwan and uses it as a base for European merchants to trade in. It is far from the capital Kaifeng, allowing China to protect trade on the Yellow River by keeping colonisers away.
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Britain sends its first official envoy to China, which starts a trade relationship between Britain and Wén. Britain is allowed use of ports along the Yellow and the Yangtze Rivers, like Yangzhou. They also receive a small embassy in Zhoushan.
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This sees a transition from the imperial system of the previous dynasty, to a parliamentary system similar to that in China's trading partner Britain.
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Catalysed by the modernisation of China as a result of its relations with Britain, Commmodre Matthew C. Perry is sent by the United States to force the opening of Japanese ports.
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China supports Britain with supplies in the war against the Russian Empire.
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The China-Britain and Japan-USA alliances become adversaries on the international stage, due to hostilities between Britain and the USA. Tensions start to thaw towards the turn of the century.This is further facilitated by the outbreak of war in Europe, which causes them to be allies against the Central Powers.
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China starts to become less isolationist and regionally-focused, and becomes a more important player in world events. This change is accelerated by the onset of war in 1914, the rise of communism in Mongolia and the subsequent threat it poses to Korea.
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This causes tensions between China and Britain, and America and Japan to dissipate in the face of a larger threat.
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The revolution, spearheaded by the Bolshevik party and their leader Vladimir Lenin, spreads to Mongolia, causing communism to be increasingly popular. This is further catalysed by the low quality of life and resentment of their Chinese neighbours for their modernisation in the 19th century.
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The Treaty on the Creation of the USSR, officially declaring the creation of the Soviet Union, causes communism to become increasingly popular in Mongolia.
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The Soviet Union-Mongolia coalition mobilises troops in Heilongjiang, while Japan tries to fortify Jilin, ready of all-out war on the JH border.
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Faced with the prospect of a crushing loss to the Soviets and the Mongols, as well as coming to realise that American support would never come, Field Marshal Yusaku Uehara elects to withdraw his troops from the Jilin Front before war breaks out.