May 9

May 13

  • Lewis and Clark in Oregon Lewis & Clark Expedition

    The first U.S. government-funded exploration of the western wilderness – primarily covering the area added to the United States through the Louisiana Purchase.

May 18

  • Mount St. Helens erupts Mount St. Helens erupts

    Mount St. Helens is an active volcano in the Cascade Mountains of the Washington state in the northwestern United States. It erupted early in the morning on May 18, 1980.

May 19

  • Pioneer homestead Homestead Act is passed by U.S. Congress

    The Homestead Act encouraged settlement of the western half of the United States by providing a low cost way for families to acquire land for small farms.

May 22

May 23