| A | B |
|---|
| wilderness | land in its wild, natural state where few or no people live |
| frontier | place where settlers land ends |
| expedition | a trip people take for a purpose |
| technology | the use of new knowledge to make new machines |
| pioneers | the first people who settled an area and get it ready for others who come later |
| territories | part of U.S. land that aren't states |
| exports | goods we sell to other countries |
| imports | goods we buy from other countries |
| tariffs | taxes on goods from other countries |
| reformers | someone who works to change things for the better |
| abolitionists | reformers who worked to end slavery |
| movement | a group of people working together to reach a goal they all share |
