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Change the layer order perhaps?

Try having the 'coastline' as the upper most layer, no fill.

Your 'states' could be each on their own layer below that, filled with whatever colour you want, and with whatever stroke you want.

Any rivers would be on a layer directly under the coastline, and therefore above the 'states'.

Experiment with it, you'll learn how the layer order can change things without editing anything.

Regards.

MrToM.