Strategy that works best for me, is at the very start of the game, make a colony, then let it make a settler before making anything else, which you take out to make a colony nearby, which won't make anything else but a settler too. One of your more settled colonies can make another settler to improve surrounding land of the colonies and lay roads. I noticed that, with this technique and finding an occasional new town from those barbarian huts, I quickly got a lint of colonies wrapped around the world, impossible for the other players to pass through, unless I want them to.
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