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Lesson 22 of 84 · U.S. History
The Cold War Era
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
1791
The Bill of Rights is ratified
1803
The Louisiana Purchase doubles the size of the U.S.
1861
The Civil War begins
Check Your Understanding
Question 1
1 of 2What tool puts events in order?