(I control all the white regions)
The key is building as much trading ports as possible - just keep 2 or 3 Naval Hospitals / Steam Drydocks in Europe and 1 in America, and build trading ports in every other port city. Then get your ships on as much as possible trading spots in the trade theatres and keep the waters clear of enemy ships.
Also keep upgrading the plantations in America - no use in having a lot of trade routes if you don't have any goods!
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