To answer the first question posed, I once was on a narrow, small 'continent' with Roman at one end and Aztec at the other. Normally Aztecs arerampant about exploring and settling. I blocked off the southern end with a city, and they did not violate the border. Blocked the north end, but the Romans kept sending settlers. I would give him two chances, then take his escort and settler--became laborerors. Then sued for peace. He repeated this about a dozen turns, until finally I had settled all theland, and sold my map.
Last night finished a week-long game Early on the Chinese put two cities smack in the middleof mine -- in a jungle. After my borders closed in, I woul dnot let him send units through. Was strong enough to force him to move. Finally he declared war...
But the strangest thing in that game, after the English turned against me, and declared war, I granted peace when they were down to one city. Later, they joined Russia and declared war on the French and me. One city. Suicide.
The aztecs I even gave a city to, one far away, to see if it would appease him. "If you are trying to bribe me, keep on..." Had ROP to enable me to get to the one English city. He only had two cities, pop4 and pop1, and a couple of spearmen, so I paid him no mind. Suddenly I get the message he has declared war. He traded mapes, and then wandered through my land and found an interior (previously Aztec) city without any defenders. So he declared war, and took it. Suicide again. I had 650 units in the field, and he declares war with three spearmen???
Of course it did used to be Aztec... but the current pop when I re-took it next turn, was 1 happy aztec, 12 happy Persians. There was no resistance.
After it was all over, Catherine said "Let me ask you a question. Can you kick... Oh, I guess so." She was the last one I elimated.
Question about that too: when I took her last city, she did not disappear. Not this is not respawning in the first few turns. SHe had 40 cities or so, enough to give me a domination victory. My spy reported one destroyer left, no other units, and no cities. Not having a clue as to where that destroyer was, I asked for peace. Next turn she attacked France, and my MPP kicked back in. Next turn france and Russia made peace. Got a map from France--sure enough there was a russian city slap in the middle of Frances north coast--with a French name, Toulouse. It had NO defenders. How did Russia move her civ onto a destroyer, then attack and take a city without any land units? And it was on an island, so she could not have walked a settler--well it was french anyway.
Towards the end... Egypt refused a trade with me, becauseof the way I "Hosed Russia". Hmmm... I never attacked Russia. First war, she attacked me. Second and third my MPP required action.... Come on--I Hosed Russia???