Meriwether Lewis (August 18, 1774 – October 11, 1809)

          William Clark (August 1, 1770 – September 1, 1838)

Along with Meriwether Lewis, Clark led the Lewis and Clark Expedition of
1803 to 1806 across the Louisiana Purchase to the Pacific Ocean, and
claimed the Pacific Northwest for the United States

 
July 21, 1969

Astronaut footprint on the Moon’s surface

The Lewis and Clark Expedition (1804–1806), was the first transcontinental
expedition to the Pacific coast undertaken by the United States. Commissioned
by President Thomas Jefferson, it was led by two Virginia-born veterans of Indian
wars in the Ohio Valley, Meriwether Lewis and William Clark. Their objectives were
both scientific and commercial, to study the area’s plants, animal life, and geography, 
and to learn how the region could be exploited economically.

1903