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1) For French, colonies were necessary to provide natural resources and other goods.
2) French built canals and drained lands in the Mekong delta To increase rice cultivation.
3)Built infrastructure and transportation facilities for the expert of agricultural produce.
4) They also developed military garrisons, to establish control over the region.
5)Construction of Trans-Indo-China rail network was taken up to connect North and Southern part of Vietnam and China
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