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Lesson 34 of 84 · World History
The Agricultural Revolution
Primary sources — letters, photographs, diaries, speeches — were created at the time of an event. They give firsthand evidence of what people experienced and thought.
Key Facts
1
Oral histories preserve community stories.
2
Primary sources come from the time of the event.
3
Historians use evidence to support claims.
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 2What is an artifact?