Clark County can be found in four U.S. states: Arkansas, Missouri, Montana (Lewis and Clark County), and Washington
William Clark learned many of his wilderness skills from his famous older brother George Rogers Clark. William was an army officer engaged in various battles with the Native Americans. Among his soldiers was Ensign Merwether Lewis whom he befriended. Meriwether later became the personal secretary to Thomas Jefferson. Jefferson selected Lewis to lead the " Corps of Discovery", an exploratory expedition into the newly-purchased Louisana Territory, and Lewis in turn selected his friend William Clark to accompany him. Clark was the Military leader and cartographer of the expedition. He made numerous maps and drawings,and kept journals of their experiences.
Notes for William Clark:
Note: Captain William (Lewis& Clark) Clark Brother of George Rogers Clark Co-leader of the Lewis & Clark Expedition, May 1804-September 1806 Bridg. General of the Louisiana Militia Superindant of Indian Affairs Indian Fighter, War of 1812 Veteran Governor of Missouri Territory, 1813-21
William Clark was born in Caroline County, Virginia, on August 1, 1770, the ninth of ten children of John and Ann Rogers Clark. His parents were natives of King and Queen County, and were of English and possibly Scots ancestry. The Clarks were common planters in Virginia, owners of modest estates and a few slaves, and members of the Anglican Church.
"The History of the Lewis and Clark Expedition", Edited by Elliott Coues, in three volumes. volume 1, back insert, 1893, reprinted regularly.
The Drapier Manuscripts: 65 volumes
Filson Historic Society