I'm worried it's too strong now. They were getting entire techs and civics from this. Raid or whatever it's called will make it insane. You don't have to take cities, you can just pillage and come out ahead. And if Sumeria is next to you... Nothing new that I could tell. Just showing when something was underpowered. I also feel canals come way too early. Suez was built in 19th century right? Were there any major canals built before that?