Explorer - Aalayah By misshammons Aug 1, 1770 when was clark born clark was born aug. 1 1770. Aug 18, 1774 when lewis was born 1774 is a long time ago. Dec 1, 1803 how it all began lewis and clark met in 1803 Dec 1, 1803 what they took on their journey food and medicane and tools and rifles Jan 1, 1804 dicovered what? they discovered the rockies. they also discovered the louisiana territory.