1. 6a: Results of improved transportation brought about by affordable automobiles
Greater mobility

2. 6a: Results of improved transportation brought about by affordable automobiles
Creation of jobs

3. 6a: Results of improved transportation brought about by affordable automobiles
Growth of transportation-related industries (road construction, oil, steel, automobile)

4. 6a: Results of improved transportation brought about by affordable automobiles
Movement to suburban areas

5. 6a: Invention of the airplane
The Wright brothers

6. 6a: Use of the assembly line
Henry Ford, automobile

7. 6a: Use of the assembly line
Rise of mechanization

8. 6a: Communication changes
Increased availability of telephones

9. 6a: Communication changes
Development of the radio and broadcast industry

10. 6a: Communication changes
Development of the movies

11. 6a: Ways electrification changed American life
Labor-saving products (e.g., washing machines, electric stoves, water pumps)

12. 6a: Ways electrification changed American life
Electric lighting

13. 6a: Ways electrification changed American life
Entertainment (e.g., radio)

14. 6a: Ways electrification changed American life
Improved communications