116: When you first meet civs, notice how they are almost certainly at cautious. The AI are sado-masochists, they love it when you take the lead, so constantly demand resources and techs ten times each time you open the trade window. It may look as if they're mad, but it secretly gives you the diplo modifier '+2 mmmm, we love it when you dominate us like that' each time you do it up to a maximum of +20 positive diplo, so do it all the time
117: Also, demand all the resources as tribute from your vassals, and do this repeatedly by opening up the trade window and ensuring they don't even have one left to monopolise them for your own civ. If they come back asking to cancel deals, renegotiate and say 'Time for your tribute, refusal means WAR'. They will never call your bluff. The AI are rock stupid and subservient to their masters, no matter how badly you treat them.