Final answer:
Crater Lake, the deepest lake in the U.S., is located in Oregon and was formed from the collapsed volcano Mount Mazama approximately 7,000 years ago, an event also chronicled in Klamath Indigenous oral traditions.
Step-by-step explanation:
The state that hosts Upper Klamath Lake, Crater Lake, the deepest lake in the U.S., is Oregon. Crater Lake was formed about 7,000 years ago when a violent eruption caused Mount Mazama to collapse and created a caldera that eventually filled with water.
This geological event is also reflected in the oral traditions of the Indigenous Klamath people, who tell the story of a cataclysmic battle between two mountains, Moy Yaina (Mount Mazama) and Mlaiksi (Mount Shasta).
The Klamath story, which speaks of a double volcanic event, is supported by geological evidence, confirming that such oral histories can indeed reflect actual historical events.