36
Lesson 36 of 84 · Westward Expansion
Sacagawea and the Corps of Discovery
Timelines arrange events in chronological order. They help us see sequences, notice patterns, and understand cause-and-effect relationships across years, decades, or centuries.
Key Facts
1
Primary sources come from the time of the event.
2
Historians use evidence to support claims.
3
Timelines show events in order.
Check Your Understanding
Question 1
1 of 2What is a primary source?