I don't think trading with foreign cities (i. e. delivering caravans) has any effect on AI attitudes. Trading or even gifting technologies does improve relations at least temporarily. However, if you are in the lead after a certain date (1750 AD?) the other civilizations get so desperate about stopping you, that there is little chance of a lasting peace. The UN and Eiffel Tower wonders do help a bit, but they won't prevent sneack attacks.
I'm not entirely certain about this, but I have the impression that the risk of sneak attacks by land can be reduced by avoiding contact with foreign land units. If you have the UN and get them to talk, they will comply with a request to leave. Such a request seems to worsen relations, but it will remove your exposure to a land sneak attack for the time being. I've used this technique with only limited success, because it does not prevent sneak attacks by sea and air and because sometimes they just don't want to talk to me (despite the patch.txt entry for the 1.10 patch that says they should talk at least once every turn).
I'm afraid the term "celebration mechanism" was not a good choice. I was referring to the "We Love the [Leader] Day" that occurs in a size 3+ city when it has at least as many happy as content people and no unhappy people. The effect under Communism is that the affected city collects resources as if its government is a Republic. This gives you the additional trade arrow, but you have to spend luxuries to get cities celebrating. I was wondering whether there are situations when using the rule to simulate a Democracy's trade income under Communism is efficient despite the required investment in luxuries.
I'm not entirely certain about this, but I have the impression that the risk of sneak attacks by land can be reduced by avoiding contact with foreign land units. If you have the UN and get them to talk, they will comply with a request to leave. Such a request seems to worsen relations, but it will remove your exposure to a land sneak attack for the time being. I've used this technique with only limited success, because it does not prevent sneak attacks by sea and air and because sometimes they just don't want to talk to me (despite the patch.txt entry for the 1.10 patch that says they should talk at least once every turn).
I'm afraid the term "celebration mechanism" was not a good choice. I was referring to the "We Love the [Leader] Day" that occurs in a size 3+ city when it has at least as many happy as content people and no unhappy people. The effect under Communism is that the affected city collects resources as if its government is a Republic. This gives you the additional trade arrow, but you have to spend luxuries to get cities celebrating. I was wondering whether there are situations when using the rule to simulate a Democracy's trade income under Communism is efficient despite the required investment in luxuries.
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