| A | B |
|---|
| cartographer | a person who makes maps |
| ally | a partnership between countries or groups of people. |
| survey | to measure, especially land |
| township | a square sectin of land in the Northwest Territory measuring 6 miles on each side, each township was divided into 36 smaller squares of land to be sold to settlers. |
| ordinance | an order or a law |
| frontier | the land beyond the settled part of a country |
| ore | rock that contains enough of one or more kinds of minerals to be mined. |
| skyscraper | a very tall steel-framed building |
| mass production | a way of manufacturing in which many items that are identical can be made quickly and cheaply. |
| interchangeable part | identical copies of parts made by machines so that if one part breaks, an identical one can be installed. |
| assembly line | a line of workers and machines along which a product moves as it is put together one step at a time |
| migration | the movement of many people who leave one country or region to settle in another |
| flatboat | a large boat with a flat-bottom and square ends |
| keelboat | a flat-bottomed boat with pointed ends and sometimes a sail, which can be poled or sailed up a river against the current |
| steamboat | a boat powered by a steam engine that turns a large paddle wheel |
| freight | goods that are transported |
| barge | a large, flat-bottomed boat used on rivers and other inland waterways. |
| paddy | a rice field |
| deforestation | the clearing of forestland by cutting down all the trees. |
