What advantage did its control of french indochina give japan in attacks starting on december 7, 1941?

I believe that the answer to the question provided above is that the advantage of the control of french indochina give japan in attacks is the advantage of the familiarization of its terrain.
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Goals of Union:maintain unity,maintain state sovereignty,defend home ground from enemy boost

Goals of Confederacy in Civil War: protect the institution of slavery,abolish slavery,international trade

Explanation: