* Language: They relied on interpreters, such as Sacagawea, who could speak several Native American languages, including Shoshone and Hidatsa. They also learned a few phrases themselves and used sign language and gestures to communicate.
* Gifts: Lewis and Clark exchanged gifts with the Native Americans they met, often giving them items like beads, knives, mirrors, and tools in exchange for food, shelter, and assistance.
* Diplomacy: They used diplomacy to establish peaceful relationships and ensure safe passage through different territories. They sought permission to travel through their lands and avoided any actions that could be perceived as hostile.
* Record Keeping: They meticulously documented their interactions with Native Americans, including their languages, customs, and ways of life. These records provide valuable insights into the lives of indigenous people in the early 19th century.
However, it's important to note that the communication was not always perfect, and misunderstandings did occur. The cultural differences between Lewis and Clark and the Native Americans sometimes led to friction and even conflict. Nonetheless, their expedition highlighted the importance of communication and understanding between different cultures.