17
Lesson 17 of 84 · U.S. History
The Spanish-American War
Westward expansion in the 1800s transformed the U.S. from an Atlantic nation to a Pacific one. The Oregon Trail, Gold Rush, and Homestead Act drove this movement.
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?