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Lesson 1 of 84 · World History
Early Humans and the Stone Age
History is the study of past events and the people, ideas, and forces that shaped them. By studying history, we understand how the world came to be and learn lessons for the future.
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.
Timeline
1969
Astronauts land on the Moon
1989
The Berlin Wall falls
2001
September 11 attacks change U.S. security policy
Check Your Understanding
Question 1
1 of 2What is a primary source?