Time machine to the early 1800s! imagine you have taken a time machine back to the early 1800s, and meriwether lewis has invited you to be a member of the corps of discovery! throughout the course of the 28-month-long journey, you have a great deal of interaction with key historical figures including lewis, clark, sacajawea, and york. you will gather information about each of these individuals as you get to know them throughout the journey and will record what you learn in your diary.