Where is the volcanic mountain, Mount St. Helens located?

Mount St. Helens is a composite (stratovolcano) in the Cascade Range of the Pacific Northwest, located in southwestern Washington State, USA; USGS places it about 50 miles northeast of Portland, Oregon, and describes its prominence in the Cascades [1]. Encyclopaedia Britannica likewise identifies Mount Saint Helens as a volcanic peak in the Cascade Range in southwestern Washington, U.S., and highlights the catastrophic May 18, 1980 eruption that made it widely known [2]. Textbook material further notes that Mount St. Helens is an active volcano within the Cascade Volcanic Arc and is most notorious for the major 1980 Plinian eruption [3]. Therefore the correct country is the United States of America.

Sources

1. [1] https://volcanoes.usgs.gov/observatories/cvo/Historical/LewisClark/Info/summary_mount_st_helens.shtml
2. [2] https://www.britannica.com/place/Mount-Saint-Helens
3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 11: Volcanism > Mount St. Helens > p. 147