Sorry, to jump onto your thread but our problems seem closely connected.
I was facing the same problem. I tried to build dye quarries abroad. First in Southern France. I was able to order them but for some reason they were never built. I assume that France didn't accept my investment?
A message stating that an investment on foreign soil wasn't accepted and thus the production site won't be built would be extremely helpful.
In the end, I built dye quarries in Mexico. But it didn't solve my problem. The goods never get back to Europe! I have a merchant fleet in the appropriate trade zone. According to the manual East Mexico should now be in blue and not in orange. What did I do wrong?
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Do I need a Prussian
harbour or
collection point, too? That is impossible to build in other "civilized" nations! What is the point to foreign investments if the goods end up staying far away from home?
Shouldn't I be able to ship them through the excisting Mexican ports?
If I am not very much mistaken the whole concept of foreign investments is almost useless (unless you invest very close to home), all I can do with these goods is offer them for sale abroad.