Wouldn't an extra settler, rather than an explorer, be more representative of an expanionistic civ? I mean, an explorer is great...but it's not really expansionistic...it's more explorationistic.
Or would an extra settler be to valuable a gift?
Or would an extra settler be to valuable a gift?

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), it'd be a nice bonus for getting to know other civs early, spying on them, popping huts faster, etc.
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