37
Lesson 37 of 84 · World History
Ancient India: The Indus Valley
Ancient Mesopotamia, between the Tigris and Euphrates rivers, is called the cradle of civilization. The Sumerians invented writing, the wheel, and early forms of government around 3500 BCE.
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?