Western dominance
Except in Java and much of the Philippines, the expansion of Western colonial rule in most of Southeast Asia was a phenomenon only of the 19th and the beginning of the 20th centuries. In the earlier period Europeans tended to acquire territory as a result of complicated and not always desired entanglements with Southeast Asian powers, either in disputes or as a result of alliances. After about 1850, Western forces generally were more invasive, requiring only feeble justification for going on the attack. The most important reasons for the change were a growing Western technological superiority, an increasingly powerful European mercantile community in Southeast Asia, and a competitive scramble for strategic territory. Only Siam remained largely intact and independent. By 1886 the rest of the region had been divided among the British, French, Dutch, and Spanish (who soon were replaced by the Americans), with the Portuguese still clinging to the island of Timor. What were often called “pacification campaigns” were actually colonial wars—notably in Burma (Myanmar), Vietnam, the Philippines, and Indonesia—and continued well into the 20th century. More peaceful Western encroachments on local sovereignty also occurred until the 1920s. Full-blown, modern colonial states existed for only a short period, in many cases for not much more than a generation.
British territorial acquisitions in Burma.Encyclopædia Britannica, Inc.
These colonial regimes, however, were not insubstantial, as they put down strong bureaucratic roots and—though often co-opting existing administrative apparatuses—formed centralized disciplined structures of great power. They were backed by the enormous economic resources of the industrialized Western nations, and by the early 20th century, having effectively disarmed the indigenous societies, they possessed a monopoly on the means of violence. There is no mistaking the impact of Western colonial governments on their surroundings, and nowhere is this more evident than in the economic sphere. Production of tin, oil, rubber, sugar, rice, tobacco, coffee, tea, and other commodities burgeoned, driven by both government and private activity. This brought rapid changes to the physical and human landscape and coupled Southeast Asia to a new worldwide capitalist system.
Indeed, colonial domination was only a variant condition in a rapidly changing world. Siam, which through a combination of circumstance and the wise leadership of Mongkut (ruled 1851–68) and Chulalongkorn (1868–1910) avoided Western rule, nevertheless was compelled to adopt policies similar to, and often even modeled on, those of the colonial powers in order to survive. Modernization appeared to require such an approach, and the Thai did not hesitate to embrace it with enthusiasm. Bangkok in the late 1920s surpassed even British Singapore as a centre of such modern amenities as electric lighting and medical facilities, and the state itself had achieved an enviable degree of political and economic viability among its colonial neighbours. The Thai may have “colonized themselves,” as some critics have noted, but in so doing they also escaped or diluted some of the more corrosive characteristics of Western rule, among them racism and cultural destruction. They also do not appear to have experienced the same degree of rural unrest that troubled their colonial neighbours in the 1920s and ’30s. They were unable, however, to avoid other concomitants of state expansion and modernization.