27
Lesson 27 of 84 · Westward Expansion
Alaska Purchase: Seward's Folly
Inventions like the printing press, steam engine, light bulb, telephone, and computer transformed how people live, work, and communicate.
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?