As much as I like seeing activity on this board, I think that you must be talking about the wrong game, Bubblepowa_x. In the DS version of the game "Anno 1701: Dawn of Discovery", there is no such concept as a "trade route". Items produced on one island automatically become part of the global pool of items available on all islands. I have played this game many times and can definitely verify that, for example, you can produce Tea on island X, and your people living on island Y will consume that Tea, without you having to do anything special.
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