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France invades Saigon, then continues to invade Laos and Cambodia. This leads to the creation of French Indochina.
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France divides up Vietnam into three regions: Tonkin, Annam, Cochin China. French uses water management to open new agricultural land in Mekong Delta.
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Nguyen Ai Quoc (Ho Chi Minh) emerges in Paris at end of World War I and tries to petition President Woodrow Wilson for self-determination of Vietnam.
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Widespread adoption of Roman alphabet transcription of Vietnamese to replace Chinese characters.
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New religion of Cao Dai founded in southern region.
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Two communist parties founded in north to resist French rule, but heavily repressed.
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World War II begins. Japan invades Vietnam.
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Viet Minh pro-Independence league organized by Ho Chi Minh (returning from exile) and Vo Nguyen Giap.
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Japanese surrender. Ho Chi Minh declares independence and unification of French colonial provinces as Vietnam.