section_path: History
section_name: History
paragraph_text: History
  
  Portions of Southwestern China, including the land that is modern day Yunnan, Guizhou, and Sichuan, were incorporated into China in 230 BCE by Qin dynasty emperor Shi Huangdi. Independent states would continue to exert influence within the region, with notable examples being the Nanzhao Kingdom in the 8th and 9th centuries CE and the Dali Kingdom in 10th and 11th centuries CE. The region was largely pacified and incorporated into the Ming domain. In the 13th century CE, the Yuan dynasty expanded its frontiers to include the Tibet plateau, which now defines China's current southwest frontier.
  
  In the 18th century CE, control of the Tibet Plateau area was important in the Great Game confrontations between the imperial powers of Russia, Britain, and China.
  
  After the warlord governments of China's Republican era replaced the Qing dynasty, government policy towards the southwest largely became one of inaction.
  
  The Second Sino-Japanese War prompted the Nationalist government to focus increasingly on state-building tasks in the southwest. The city of Chongqing served as the capital of Chinese resistance to imperial Japanese expansion.
  
  After their defeat in the Chinese Civil War, parts of the Nationalist army retreated south and crossed the border into Burma as the People's Liberation Army entered Yunnan.: 65 The United States supported these Nationalist forces because the United States hoped they would harass the People's Republic of China from the southwest, thereby diverting Chinese resources from the Korean War.: 65 The Burmese government protested and international pressure increased.: 65 Beginning in 1953, several rounds of withdrawals of the Nationalist forces and their families were carried out.: 65 In 1960, joint military action by China and Burma expelled the remaining Nationalist forces from Burma, although some went on to settle in the Burma-Thailand borderlands.: 65–66
  
  Western strategies to contain China in the 20th century CE included intervention in the Tibet plateau until almost the mid-1970s. Tibet became an increased area of concern in China's southwest after the Sino-Soviet split when Soviet soldiers on the border of Mongolia and China threatened to close the Gansu corridor, which would have left Tibet as the only reliable Chinese route to Xinjiang.
  
  During the reform and opening up era, China began to look more seriously towards integrating its southwest regions. China's increased focus on trade-led development and its transition to a socialist market economy helped trigger a reorientation to the southwest as its lagging development became increasingly seen as an impediment to growth. China's southwest development initiatives reflect an awareness that economic engagement is the most cost-effective way to decrease political unrest and remedy underdevelopment along this frontier.