28
Lesson 28 of 84 · History
September 11 and Its Impact
Indigenous peoples lived in the Americas for thousands of years before Europeans arrived. They developed diverse cultures, languages, and agricultural systems across the continents.
Key Facts
1
Historians use evidence to support claims.
2
Timelines show events in order.
3
Cause and effect explain why things happen.
Timeline
1803
The Louisiana Purchase doubles the size of the U.S.
1861
The Civil War begins
1865
The Civil War ends; slavery is abolished
Check Your Understanding
Question 1
1 of 2Why do we study history?