So, I'm trying to set up a custom map of the world, complete with city-states. But the city-states keep getting linked somehow to civilizations and their leaders. For instance, when I meet Venice (on turn 6, let us say), I wind up "meeting" Washington or Hiawatha or some other jerk whose civilization I put on the other side of the world and who shouldn't come onto the scene for at least 150 more turns. When I try to cross the city-state's territory I get a message: "This will cause war with Washington/Venice." This is not what I want. 
How do I get it to stop doing this? Not all of the city-states get these associations, but for the life of me I can't see how the settings for the non-linked city-states differ from those of the city-states that have these links. In WorldBuilder I have everyone set to different teams, so that shouldn't be it. What am I overlooking?
I've tried getting around the problem by deleting the civilization that got tagged with the city-state, but when I do this either it gloms onto another civilization (so that it jumps from Hiawatha to Washington), or some other city-state suddenly decides that it wants to be a colony of some major civilization.
Help?

How do I get it to stop doing this? Not all of the city-states get these associations, but for the life of me I can't see how the settings for the non-linked city-states differ from those of the city-states that have these links. In WorldBuilder I have everyone set to different teams, so that shouldn't be it. What am I overlooking?
I've tried getting around the problem by deleting the civilization that got tagged with the city-state, but when I do this either it gloms onto another civilization (so that it jumps from Hiawatha to Washington), or some other city-state suddenly decides that it wants to be a colony of some major civilization.
Help?