68
Lesson 68 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
Historians use evidence to support claims.
2
Timelines show events in order.
3
Cause and effect explain why things happen.
Check Your Understanding
Question 1
1 of 2Why do we study history?