Sino-North Korean relations had been relatively stable before Kangxi. On land, North Korea has not made any territorial claims. During the Kangxi Dynasty, because there was no clear territorial boundary between the two countries, the Chinese side always considered us to be a suzerainty and did not pay much attention to territorial issues, after all, China was not a modern country at that time.
The DPRK side has also responded with the "big thing doctrine", which is relatively ups and downs. However, in terms of people, from the Kangxi dynasty, the disputes between the two countries gradually increased, mainly because Lee's Korea often entered the "forbidden" land, resulting in an increase in contradictions. To this end, the Kangxi Dynasty sent people to the border with Korea in 1712.
Changbai Mountain Tianchi
The origin of the inter-island problem
During the more powerful period of the Qing Dynasty, the two sides agreed that "the west is Yalu and the east is the Tumen, so the stone is recorded on the watershed". Because North Korea suffered disasters and people kept running to China's side to reclaim the land, China asked North Korea to take back its people, but North Korea was unwilling, so China had to include them in Chinese nationality.
However, more and more North Koreans ran to China to reclaim the land, and as a result, the North Korean forces also entered the Chinese side with the reclamation people, and there was a sovereignty dispute, and the two governments began to intervene. This is called the "island problem."
After the defeat in the Sino-Japanese War, Japan began to intervene in the "Inter-Island Issue" and helped Korea (the Korean Empire) seize Chinese territory. In fact, the annexation of Korea was Japan's established plan to help the Korean Empire seize Chinese territory, which was actually for japan in the future.
The Qing Dynasty, korea and Japan, Tsarist Russia
In 1897, after Lee's Korea was renamed the Korean Empire, with the support of Japan, he began to take advantage of the "Inter-Island" problem caused by the Korean people running to China to reclaim the famine, and gradually invaded Chinese territory.
In 1904, after the Russo-Japanese War, Japan seized "Southern Manchuria" from Tsarist Russia. At the same time, the First Japan-Korea Entente was signed, and the Korean Empire gave most of its diplomatic and financial powers to Japan.
On 5 September, the defeated Russia and Japan signed a peace treaty with Japan in Portsmouth. The Treaty of Portsmouth provides that:
Russia recognizes that Japan has any right to deal with Korea;
Russia transferred lushunkou, Dalian Bay and its surrounding territories, the right to lease territorial waters, and other related privileges to the Government of Japan;
Russia will transfer the railway and all branches from Changchun (Kuanchengzi) to Lushunkou, as well as all the rights, property and coal mines attached to it, to the Japanese government.
Russia ceded the southern part of Sakhalin Island and the lease of the Liaodong Peninsula and all the islands in its vicinity to Japan forever.
In October, Japan issued the Decision on the Establishment of Korea's Right of Protection, which led to the signing of the Second Japan-South Korea Protection Treaty. South Korea's diplomatic power was completely vested in Japan.
On July 30, 1907, the Russo-Japanese Agreement and the Russo-Japanese Secret Treaty were signed. Japan and Russia privately divided their respective forces, dividing the three northeastern provinces of China into two parts, Southern Manchuria and Northern Manchuria, with the Songliao Watershed as the geographical boundary. North Manchuria to the north of this line, south to South Manchuria. The forces of Northern Manchuria were Tsarist Russia and Southern Manchuria was Japan. This is also the first time that the term "North and South Manchuria" has been recognized by the government.
At the same time, Tsarist Russia reaffirmed that Korea was Japan's sphere of influence. Some readers simply do not understand "spheres of influence" and "possession". The sphere of influence here is not occupation, military occupation, but in a certain region, a certain power enjoys certain privileges in politics, economy, and military, such as tax exemption, such as inadvisibility in a certain area.
How the Japanese Empire supported Korea's annexation of Chinese territory
In 1906, South Korea's minister of state, Park Ki-chun, asked Japan to protect the people who had cultivated land on the Chinese side and asked Japan to negotiate with China on its behalf.
In 1907, as soon as Japan received a request from the South Korean side, it immediately set up a police station in Longjing (now a county-level city) in Yanbian, Jilin Province, China. The Japanese army made a claim to exclude China to Korean immigrants who were reclaiming the land in China.
For example, The Island of Ma (present-day Yanbian City) was Korean territory; Koreans could not obey the qing government's judgment; the qing state's taxes on reclamation were acts of oppression; the decrees issued by the Qing state on the island were invalid; and the township treaties and township treaties sent by the Qing state were regarded as Koreans.
China and North Korea had three diplomatic negotiations on the border: 1712, 1885 to 1887, and 1902 to 1904. The border between the two countries is demarcated, and to this end, all Japan has to do is to help the Korean Empire overthrow the results of existing diplomatic negotiations.
The Japanese side first carried forward the fabricated Liangjiang theory
In November 1905, Yoshimichi Furukawa, commander of the Japanese Army in Korea, submitted the "Investigation Materials for the Realm of Majima" to the Army General Staff Headquarters. The information proposes to formally accept the two rivers, that is, Tumen and Douman liangjiang.
He declared that the boundary set by The Chinese Dynasty in 1712 was wrong, and that the Boundary was set by the "Tumen River" (the upper reaches of the Songhua River) rather than the "Douman River" (Tumen River). Therefore, sovereignty over the wasteland reclaimed by the citizens of the Korean Empire south of the Tumen River and north of the Douman River (Majima) belongs to Great Korea.
The Korean people opened up the wasteland in the forbidden lands of the Qing Dynasty, roughly between the east of Mount Mao and the city of Wencheng. For this area, it is very important for the Japanese army to propose a strategic position.
First, the geographical location of the island is important, and the reclaimed land is easy to obtain food;
Second, the island is highly grounded, and it is a place where soldiers must fight;
Third, the island is very close to South Korea and Russia, which is convenient for consolidating rule over South Korea and forming a stranglehold on Russia.
In order to strengthen the historical persuasion, the Japanese military found news drummers and historians, the former being Kitaro Nakai, the former editor-in-chief and chief writer of the Yomiuri Shimbun, and the latter Beinghujiro Naito (Torajiro Naito).
Nakai infiltrated Yanbian, where the Russians had not yet fully withdrawn, in May 1905 to conduct intelligence work. Naito was a Japanese academic authority on Chinese studies and the founder of the Kyoto School. His most well-known views in Chinese history are the "Tang and Song Dynasties Theory of Change" and the "Theory of Cultural Center Movement". Both of these doctrines have now become basically academic conclusions.
Therefore, Naito Hunan is very familiar with Chinese history, the ability to understand is very high, and the ability to collect historical materials and tamper with historical materials is also quite high. Therefore, after the two submitted several reports, the Japanese army decided to use this as a model to attack the Qing government and usurp Chinese territory for the Korean Empire.
What does this mean? Learning, science, medicine, etc. all have no borders, but those who study these have borders! In particular, history, because of many reasons such as text understanding and data search, is ambiguous, which has room for artificial control. The possibility of historians acting as executioners and robbers also exists.