Final answer:
Washington state is the U.S. coastline most likely to experience a tsunami due to the Cascadia Subduction Zone's potential for generating significant earthquakes.
Explanation:
Washington state is the U.S. coastline that has an offshore subduction trench and is most likely to experience a tsunami. The Cascadia Subduction Zone off the coast of Washington, Oregon, and northern California can generate significant earthquakes, leading to tsunamis that can reach coastal cities within minutes.
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