Thomas Jefferson assigned Merriweather Lewis the captain of the journey into the west of the United States after purchasing a huge amount of the United States. Merriweather Lewis later made William Clark his co-captain.
Their journey to travel across the United States to the Pacific Ocean took about two and a half years.
The crew were low on supplies and were facing cold temperatures. They started facing challenges but they still continued on their journey.
Sacagawea a Native American woman helped Lewis and Clark explore the Louisiana territory and offered them food.
During their journey some of their equipment was damaged, their food supply was low, but they still continued and only a total of two people died.
In the end they made it to the other side of the United States and reached the Pacific Ocean and discovered a large amount of species of plants and animals.