In their exploration of the Western United States in 1804, Lewis and Clark were using Sacagawea as an interpreter with the native people as they traveled west. Before they crossed the Rocky Mountains, they had to secure horses for their journey across in order to survive. The local Indian tribe didnt trust Lewis and Clark and believed they might be a war party. As Sacagawea was interpreting and talking with the Indian chief and getting nowhere, she suddenly realized that the chief is actually her long lost brother and breaks down hysterical crying. She was taken as a slave from a neighboring tribe at a very young age. It completely changed the direction of the talks and Lewis and Clarks party of 40 people got their horses.