At the same time as the Kongsi-led National Alliance party in British Malaya slowly gained influence, Chen Jiongming retired from his governorship of Guangdong province, arriving in West Kalimantan in the Dutch East Indies in 1928. [...]
Chen began the creation of a secretive militia in 1928, establishing training and base camps deep in the jungles of West Kalimantan. [...] In 1930, Sultan Muhammad Al-Kadrie, with the military backing of Chen’s forces, unilaterally declared independence from the Dutch East Indies, establishing military control of the cities of Pontianak, Ketapang, and much of the western coast of Kalimantan. Numbering in the thousands, Chen’s militia force easily overwhelmed the small Dutch garrison stationed in West Kalimantan, capturing many European and mixed-race intellectuals residing in the province as hostages. [...]
In 1931, Chen proclaimed himself president of the Second Lanfang Republic, establishing a capital at Pontianak. However, in order to appease the Malay inhabitants of Kalimantan, Sultan Muhammad Al-Kadrie remained in power as ruler of the existing Sultanate. As the sultanates of Southeast Asia claimed authority only over their subjects and not the land on which they resided, the Second Lanfang Republic established sovereign control of land while the Sultanate of Pontianak remained intact, with the Chinese inhabitants of Kalimantan provided citizenship to the Republic and Malay inhabitants provided the citizenship of the Sultanate, but with the option of obtaining the additional citizenship of the Republic.
In this unique dual-government system of rule, Chen Jiongming was able to secure both the role of president of the Second Lanfang Republic and Speaker of the Legislative Council of Pontianak. [...] Appealing to many conservative voices within the Kuomintang, Chen proclaimed the Second Lanfang Republic a tributary to the Republic of China, invoking its former status as the “Celestial Empire” and imperial tributary system during its nearly three millennia-long legacy of imperial rule. [...] Under the rule of his successor Tang Shaoyi, the mining, logging, and rubber-tapping operations Chen had established in Borneo’s interior expanded in scale, allowing the Second Lanfang Republic to become one of the wealthiest countries in Southeast Asia. The establishment of a protectorate under the Republic of China had also represented, to many, the potential first steps toward the reestablishment of the old tributary system under Imperial rule.