67
Lesson 67 of 84 · World History
Ancient Mesopotamia: The Cradle of Civilization
Secondary sources — textbooks, documentaries, encyclopedia articles — are created after an event. They analyze and interpret primary evidence to build a broader understanding.
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
1869
The Transcontinental Railroad is completed
1920
Women gain the right to vote (19th Amendment)
1929
The Great Depression begins
Check Your Understanding
Question 1
1 of 2What tool puts events in order?