I never really trade with the indians, except for horses and muskets if I need them to fight someone. My goods are usually sold through custom houses, so I doubt that was the case.
I know they'll send a lot of converts (not slaves), I tend to use missionaries a lot since it's cheap labour. Good way to get rid of Indentured Servants and Petty Criminals too, making them missionaries.
I suppose it might be a bug, but it just doesn't seem like it.
If I remember correctly, I had a road connecting their capital with one of my cities and it (possibly) happened around the time I built an Iron Works, possibly in that city.
That may have something to do with it I suppose.
In any case, I'm trying to see if I can make it happen again in the game I'm playing now. Got Adam Smith, got the road connecting, haven't built an Iron Works yet but a Textile Mill. Nothing has happened yet though...
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