* Mount St. Helens, Washington: This stratovolcano famously erupted on May 18, 1980, causing significant devastation and changes to the landscape.
* Kilauea, Hawaii: This shield volcano has been erupting continuously since 1983, with the most recent eruption ending in 2018. It is known for its slow, steady lava flows.
These are just two examples, and there have been other eruptions of volcanoes in the mainland US in the 20th century.
