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Lesson 22 of 84 · American Revolution
Spies and Secret Codes
During World War II (1939–1945), the Allies fought the Axis powers. The conflict affected every continent and led to lasting changes in borders, governments, and cooperation.
Key Facts
1
Cause and effect explain why things happen.
2
Oral histories preserve community stories.
3
Primary sources come from the time of the event.
Timeline
1776
The Declaration of Independence is signed
1787
The U.S. Constitution is written
1791
The Bill of Rights is ratified
Check Your Understanding
Question 1
1 of 2What tool puts events in order?