Meriwether Lewis was chosen to lead the expedition at the age of 28.
William Clark was asked to join at the age of 32 by Lewis. He kept records in order to create a detailed map.
Sacagawea helped the explorers find edible plants and worked as an interpreter.
The idea of the expedition started when Thomas Jefferson wanted to expand the United States to the west. He chose Meriwether Lewis to lead the expedition. Meriwether then asked his friend William Clark to join. All men who attended were chosen based on their abilities and skills.
Lewis and Clark needed to find the Pacific Water Passage which was seen as the key to the westward expansion of the United States.
During the expedition, Lewis and Clark met Sacagawea who helped them as an interpreter for other tribes and helped them find edible plants.
After a year and a half the explorers successfully made it to the west after having to suffer threw starvation and extremely cold weather.