Sumatra's East Coast Residency
Sumatra's East Coast Residency () was an administrative subdivision of the Dutch East Indies with its capital in Medan. It was located in northern Sumatra. Formation
From the early 19th century the Dutch gradually took control of Sumatra, starting from the south. In Eastern Indonesia, the sultanates of Asahan, Serdang, Deli and Langkat were subjugated between 1662 and 1865, and these sultans were subsequently used by the Dutch to indirectly rule the 'native states', as they became known. The inland Batak areas were under Dutch control by 1895. The East Coast Residency was established in 1873, and took its final form in 1908 after Tamiang, a small area in the north, was transferred to Aceh

Plantations
In 1863, the first Dutch settler, Jacobus Nienjuys, arrived and began to plant tobacco, nutmeg and coconut. Others followed, and established plantations to grow tropical crops such as tobacco, rubber, palm oil and coffee. These plants grew very well in the region's volcanic soil. By 1938, there were 10,026 square kilometers of plantations in the northern part of the residency, known as the Estates Area. Administration
In 1938, all ten residences on the island of Sumatra were brought together to form the Gouvernement of Sumatra, with Medan as its capital. The head of each residency was a resident. Under the resident, there were assistant residents, controllers and district administrators, who were responsible for the subdivisions of the residency. In East Sumatra, as well as the directly governed areas, there were 34 native states, which were autonomous to a degree, They comprised:
 Five Malay sultanates (Asahan, Deli, Langkat, Serdang and Siak)
 Malay principalities
 Batak states
The towns of Medan, Pematang Siantar, Tandjong Balai, Tebing Tinggi and Bindjei were enclaves within the native states. The first two were governed by a mayor, and the latter three by the assistant resident. Population 
Before 1863, when the first Europeans arrived, the region was populated by a few thousand Malays. As labourers from outside the region were brought in to work on the plantations, the population grew rapidly. Initially these immigrant workers came directly from China, and from 1872, Java. In the late 1880s, the number of Chinese labourers brought in by the tobacco companies reached 20,000 per year. The work force on the coffee, rubber, tea and oil-palm plantations, which began to be planted in the late 1890s, was entirely ethnic Javanese. As of 1938, the "native" population was dominated by ethnic Javanese, mostly from central Java, followed by Bataks. There were also Banjar people from southern Borneo and Mandailing people from west Sumatra. Most of the "other orientals" were from China, but there were also Indians and Arabs. Most of the managers of the tobacco plantations and half the managers of the rubber, tea and oil plantations were Dutch, but there were also other Europeans and Americans. Notes

References