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Brazil was not part of French Indochina before world war 2.
France ruled it, and this is why it was called "French" Indochina.
The French had fought there from 1946 to 1954; 1st Indochina War or French Indochina War.
Invasion of French Indochina happened on 1940-09-26.
French Indochina consisted of parts of Vietnam, Cambodia and Laos.