Final answer:
Oregon is the U.S. state least likely to have a tsunami among the mentioned locations due to the characteristics of the Cascadia Subduction Zone.
Explanation:
Oregon is least likely to have a tsunami among the given U.S. state coastline locations without an offshore trench. This is due to the computer modeling of the Cascadia Subduction Zone predicting a different outcome for northern California compared to regions farther north like Oregon and Washington. These areas are expected to experience sudden subsidence during earthquakes, increasing the likelihood of tsunamis.
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