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In page French Indochina:

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Territorial conflict in the Indochinese peninsula for the expansion of French Indochina led to the Franco-Siamese crisis of 1893. In 1893 the French authorities in Indochina used border disputes, followed by the Paknam naval incident, to provoke a crisis. French gunboats appeared at Bangkok, and demanded the cession of Lao territories east of the Mekong River.[citation needed]