On May 18, 1980, which Cascades volcano blew its top with the largest eruption in North America in recorded history?

Name: On May 18, 1980, which Cascades volcano blew its top with the largest eruption in North America in recorded history?
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Mount St. Helens, located in Washington State, experienced a major volcanic eruption on May 18, 1980. This event is noted as the most significant eruption in North America in recorded history, causing extensive damage and loss of life.

On May 18, 1980, Which Cascades Volcano Blew Its Top