Can't make warless conquest too easy or there's no cause for war. It just becomes the stupid way to invade. Supposed to be a little challenging if you are trying nothing but a CIA style war of attrition.
I find that's usually the case because I built all the production enhancing wonders there and I usually make sure to give the capital as much productive land as I can.
2. He's asking the opposite question - why does it take MORE turns in the capital?
I can't comment, nor have much of an idea, just translated the question, lol.
1. Check out my thread in Multiplayer, lol.
If you (anyone) want a "warless war", you MUST go for Neanderthals.
A Neanderthal Spiked Clubman is the guy in question:
It can grow quite strong while still maintaining the "no nationality" feature.
And if you play smart, namely build not 3, but 9 of them for later merging (they obsolete, not get killed, lol) - you'll still have a serious stealth attacker way into the Ancient Era.
Which would by then also have immense experience that would easily make it a mega unit all on its own.
A couple "+1 Strength"s, a "Quality" promotion (if not two) - and that's gonna be a beast, that is still "not yours", so "not your responsibility.
And then, just accompany it with a normal unit, so that you can immediately capture the "Barbarian" city that stays after the first conquest.
LOOOL!
https://forums.civfanatics.com/thre...ny-cities-israel-personal-modmod-edit.678800/
https://forums.civfanatics.com/attachments/civ4screenshot0000-jpg.639335/
The later one is upgraded, but even if not, it'd still be 9 Strength, lol.
And that's not the end of it, plus all the other promotions it can get on the way.