May 22nd, 1915
Lassen Peak erupts with a powerful force, and is the only mountain, other than Mount St. Helens, to erupt in the continental US during the 20th century. event on May 22, 1915. Read about how to open files in Open File Database.
Events around May 22, 1915
| May 24th, 1915 | Event | World War I: Italy declares war on Austria-Hungary. |
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