They used levees, which were walls used to keep water flowing where it was wanted/ needed.
Answer:
When the French arrived, they helped build the Vietnamese empire which was headed by a prince. The empire successfully built, To return the favour, the French missionaries were allowed to spread Christianity in Indochina. They were also regarded as the advisers of the local dynasty.
Explanation:
Answer:Railroad companies could never agree to use the same gauge - the space between the rails. After the revolution in transportation, almost all the ordinary items people needed had to be made locally.
Explanation:
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Limits on international trade with south Africa. C is your answer
