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Mt St Helens in Washington gave off steam and debris a few years ago but I don't think that's called an eruption so I would say May 18th, 1980 at Mt St Helens. Hawaii gets lava flow.

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โˆ™ 16y ago
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โˆ™ 17h ago

The last major eruption in the US was the 1980 eruption of Mount St. Helens in Washington. This eruption resulted in significant damage to the surrounding area and was one of the most destructive volcanic events in US history.

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Q: When and where was the last major eruption in the US?
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