The trade effeciency is already applied, assuming you double your TE, you'll see the 20 become 40. Also, some stuff will update on next month, perhaps that's why your national idea did not take effect yet.
I have a question about fighting battles. If I send my unit to attack someone, would their unit only use their defensive stats, and mine his offensive, until that combat is finished, or do the units takes turns being offense and defense? Thanks.
Yes, the alliance shouldn't end because of that. I do it all the time. Is the war still going? Did France concede and perhaps have to anull treaties with you?
the 5.1 patch note for Divine wind states "- Naval maintenance is no longer a joke." what exactly does this mean? does it mean the AI now experiences naval attrition or something to the player that I am missing?
Well I can't see why they would of accepted anything, but peace. They're territories wasn't ceased. I'm pretty sure they won the war being as they took some provinces, unless that was in a different treaty. Perhaps they just cancelled it after with me next in their plans for domination. We was allied but the relationship was only fairly low.
I also have 2 PU's and neither wish to integrate and both say unlikely... my infamy is 25, and prestige full. Surely infamy doesn't have that much of an effect does it?
In my current game, the province of Sidon is unclickable. This is rather annoying, seeing as Sidon/Syria is an OPM enclave in my lands... I tried reloading (without quitting the game), it didn't help. Is there any known solution to this?