56
Lesson 56 of 84 · History
Immigration to America: Ellis Island
The Cold War (1947–1991) was a period of tension between the U.S. and the Soviet Union. It involved an arms race, space race, and competition for global influence.
Key Facts
1
Primary sources come from the time of the event.
2
Historians use evidence to support claims.
3
Timelines show events in order.
Check Your Understanding
Question 1
1 of 2What is a primary source?