Diplomacy and the opinion of another civ to you has always been a bit vague on how it worked and what factors do what. Could someone please help explain it in detail to me? For instance what are all the factors that give +/- opinion? What do the Open Borders, Free Trade Agreement, Embassy, etc do? Some I know some, but other answers I don't know. And I suspect some wonder too but never asked. So I am making this thread to ask it all and maybe even earn something I did not know. If you do know or think you know or even have additional questions please post.