About travelling?

I have dual citizenship. I came to Switzerland with my American passport as I was visiting friends (and the other had expired). At the same time, my Swiss passport needed to be renewed. I got it done. The thing is, the lady stamped my American passport not realizing I have both citizenships. I plan to visit other... show more I have dual citizenship. I came to Switzerland with my American passport as I was visiting friends (and the other had expired). At the same time, my Swiss passport needed to be renewed. I got it done. The thing is, the lady stamped my American passport not realizing I have both citizenships. I plan to visit other countries. After Switzerland, Israel & then Romania. What passport should I use? Does anyone know what is required?
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