The one that every schoolchild learns about began in 1804, when Thomas Jefferson sent Meriwether Lewis ... which enable the creation of maps in three dimensions. Lewis and Clark traveled for ...

Biography.com looks at U.S. explorers Meriwether Lewis and William Clark and how their passion for horses inspired a ...

July 4, 1804—To mark our first Fourth west of the Mississippi, Lewis directed me to powder the keelboat's cannon so he could fire it. I would have liked to shoot it too, but that's OK.

We begin this month with Jefferson’s June 20, 1803, directive to Meriwether Lewis outlining the president’s goals for the expedition. We’ve kept his sometimes unique spelling and punctuation ...