Which Southeast Asian nation was the only one to remain independent from European intervention?

Name: Which Southeast Asian nation was the only one to remain independent from European intervention?
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Question

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Thailand (formerly known as Siam) was the only Southeast Asian nation that successfully avoided colonial rule, primarily through skillful diplomacy, negotiating treaties with European powers, and modernizing reforms that kept the country sovereign while its neighbors were colonized.

Which Southeast Asian Nation Was the Only One to Remain