22
Lesson 22 of 84 · Industrial 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
1861
The Civil War begins
1865
The Civil War ends; slavery is abolished
1869
The Transcontinental Railroad is completed
Check Your Understanding
Question 1
1 of 2What tool puts events in order?