| A | B |
|---|
| frontier | edge of a settled area |
| pioneer | people who settle on land that is new to them |
| reservation | land set aside by the government for Native Americans |
| mass production | manufacturing large numbers of products with identical parts |
| assembly line | each worker performs a single task on a production line |
| robots | machines controlled by computers |
| food processing | turns crops and animal products into foods we eat |
| grain elevator | huge storage bin |
| agribusiness | large farms owned by companies |
| combine | cuts and threshes wheat |
