72
Lesson 72 of 84 · Westward Expansion
Building the Transcontinental Railroad
The Roman Empire spread across Europe, North Africa, and the Middle East. Rome built roads, aqueducts, and legal systems. Architectural innovations like the arch and dome still influence building today.
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?