October 1, 1949: PRC is established, territorial claims largely the same as the ROC's (Mongolia at the time was acknowledged to be independent by both ROC and PRC, though later on ROC rescinded on this)
March 5 - May 1, 1950: PRC gains control of Hainan island from the ROC.
May 23, 1951: Seventeen point agreement signed; Tibet acknowledges PRC sovereignty.
1952: a small section of Guangdong's coastline was given to Guangxi
August 7, 1952: Provinces of Anhui and Sichuan are restored.
November 15, 1952: Province of Jiangsu is restored. Pingyuan and Chahar are split into their surrounding provinces. Nanjing, old capital of the Republic of China, is deprived of municipality status and annexed by Jiangsu province.
July 8, 1953: Changchun and Harbin are elevated to municipality status.
February 11, 1958: Tianjin municipality merged with Hebei province.
March 5, 1958: Guangxi becomes the third autonomous region.
October 25, 1958: Ningxia (split back out of Gansu) becomes the fourth autonomous region.
October 1, 1960: Sino-Burmese border treaty. The ROC and PRC claimed some areas of territory south of the Burmese section of the McMahon line. British administration of Burma directly administrated only ethnic Burmese areas, and indirectly governed other areas. As a result, the administrative borders were considerably south of the McMahon line, while ethnic groups in those areas often paid tribute to both China and Burma. In the 1960 treaty, the PRC largely abandoned such claims and largely accepted the Burmese McMahon line as the border, while Burma ceded three Kachin/Jingpo villages to the Chinese side and recieved a Chinese village. The territories exchanged (see Map No. 2) included Hpimaw-Gawlum-Kangfang (59 square miles) to China, the Namwan Assigned Tract (85 square miles) to Burma and the Panhung-Panlao tribal area (73 square miles) to China.[1][2][3]
October 5, 1961: Border treaty with Nepal, with about 200 mi² disputed, with the PRC largely deferring to Nepali claims. Demarcation continues until 1963. [4]
1962: PRC-North Korea border treaty, which sets the previously undemarcated section of the Sino-Korean border along the Changbai mountains. No territorial disputes, however both sides had differeing maps shwing the Changbai mountains as theirs, the treaty set the boundary that divided the Changbai mountains and Lake Tianchi roughly in half between the PRC and DPRK. [5]
December 26, 1962: China-Mongolia border treaty [6]
November 21, 1962: end of Sino-Indian war, which resulted in the modern Line of Control.
March 2, 1963: Pakistan transfer control of the Trans-Karakoram Tract to China.
1964: Demarcation of border with Mongolia finished.
November 22, 1963: Border treaty with Afghanistan. No territorial disputes, but the border was demarcated. [7]
January 2, 1967: Tianjin municipality split back out of Hebei.
1969: During the Cultural Revolution, much of Inner Mongolia was distributed among surrounding provinces, with Hulunbuir divided between Heilongjiang and Jilin, Jirim going to Jilin, Juu Uda to Liaoning, and the Alashan and Ejine region divided among Gansu and Ningxia
1969: Sino-Soviet border clashes.
1974: Battle of Hoang Sa, the PRC gains control of the Paracel Islands from South Vietnam
April 13, 1988: Hainan split out of Guangdong and formed as a province.
1991: Sino-Soviet border agreement, right before the collapse of the USSR. Demarcation work begins
1992: China and Kyrgyzstan begin border negorations over five disputed former Qing areas.
1994: China and Kazakhstan border agreement, two disputed areas remain.
1996: Border agreement with Kyrgyzstan. Settles disputes in four disputed areas, dividing them up largely 50-50 for each side. Not sure of the details. One disputed border area remains.
March 14, 1997: Chongqing municipality formed out of Sichuan.
July 1, 1997: Hong Kong made a Special Administrative Region.
1998: Disputes with Kazakhstan settled. 940 km² of Kazakh-administered territory still remained disputed in the two areas of Shagan-Oba and Saryshilde. In the agreement, 56% of this disputed area was kept by Kazakhstan and 44% handed to China.
December 20, 1999: Macau made a Special Administrative Region.
1999: Kyrgyz-China supplementary agreement. 950 km² remained disputed in the Bedel area. In the agreement, 70% of Bedel remained with Kyrgzstan while 950 km² went to China, and the border near Mt. Khantengri was demarcated.
1999: By 1999, all changes in the negotiated 1991 Sino-Russian Border Agreement put into place. Complex agreement with hundreds of border islands changing sides (see article for details), but major changes include the transfer of Zhenbao Island and Mekeseli to China.
1999: China and Tajikistan border agreement. Some disputed areas remain. Not sure of the exact details.
1999: Border agreement with Vietnam, which demarcates both the land border and sea border. Details on the agreement haven't been released
2002: Supplementary border agreement with Tajikistan. China had territorial claims on 28,000 km² of former Qing land in the Pamir mountains of Tajikistan, amounting to ~1/7 of Tajikistan's total land area. In the border agreement, about 1,000 km² is ceded to China in exchange for China relinquishing claims on the rest.
2004: Supplementary Sino-Russian border agreement. Abagaitu and part of Heixiazi handed to China.
