first level diplomacy tech
colecting and spend money to gifts mixed with proposing trade agrements
Colonize
Maybe facot of positive relation time should be added and relations of 25 pts is too small. ... i know it's harder too do that the AI can deal with this.
I writing this topic becouse it has a key impact in early and early-mid stage of the game, strongly when galaxy conditions are with sparse colonizable planets and independets (btw it's more fun

Sorry for my english!
Thanks
