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Lesson 82 of 84 · Westward Expansion
The Pony Express
The Industrial Revolution changed manufacturing. Factories replaced workshops, machines replaced hand tools, and cities grew rapidly as people moved from farms to find jobs.
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.
Check Your Understanding
Question 1
1 of 2What tool puts events in order?