| A | B |
|---|
| Who invented the telegraph? | Joseph Henry |
| When did Joseph henry invent the telegraph? | in 1830 |
| What happened when telegraph lines were put up? | news could travel with lightning speed |
| Who invented the first safe elevator? | Elisha Otis |
| What is an assembly line? | a line of workers and machines all working together to make a final product |
| What does a skyscraper do? | makes it possible for more people to work and live in big cities |
| When was the transcontinental railroad built? | in 1869 |
| Why was the transcontinental railroad built? | to improve transportation across the continent |
| What is an elevator? | a machine that moves people up and down in a building |
| What did an assembly line do for Henry Ford? | made car manufacturing easier |
| What was the transcontinental railroad a big improvement over? | harsh wagon trails |
| Who changed the way cars were made? | Henry Ford |
| How did Henry Ford change the way cars were made? | He made them popular and easy to afford. |
| How did Henry Ford us an asembly line of workers and machines? | They produced cars faster and made them easier to afford. |
