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Lesson 4 of 84 · U.S. History
The American Revolution
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
Oral histories preserve community stories.
2
Primary sources come from the time of the event.
3
Historians use evidence to support claims.
Timeline
1787
The U.S. Constitution is written
1791
The Bill of Rights is ratified
1803
The Louisiana Purchase doubles the size of the U.S.
Check Your Understanding
Question 1
1 of 2What is an artifact?