that was a little vague. let me clarify:
with GB, your capital is london. which means any ports in london region that are trade ports will trade with other factions, and import goods from america as well if you have colonies there.
however, if you have roads built, then the ports in scotland are connected to london by roads (which you can check on the campaign map). but, since ireland is not connected by land routes, its ports cannot trade with other nations.
since you had an 'Americas empire', it makes sense that you would think those ports can trade as well. unfortunately that is not the case. it is, however, it is in your best interest to build up fur and other valuable resource buildings so you will become richer from your trade with other nations.
I know its hard to understand.
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