| A | B |
|---|
| cartographer | a person who makes maps |
| ally | a friend, a partner in an alliance, especially in times of war |
| survey | a measure |
| township | a square section of land in the Northwest Territory measuring 6 miles on each side; each township was divided into 36 smaller spares of land to be sold to settlers |
| ordinance | a set of laws |
| frontier | lands beyond the settlement |
| ore | rock that contains one or more kinds of minerals |
| skyscraper | a very tall building |
| mass production | making many products that are alike, quickly and cheaply using machines |
| interchangeable parts | parts made by mass production that are the same |
| assembly line | a line of workers along which a product moves and 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 raft made of boards that are tied together |
| keelboats | similar to flatboats, but pointed at both ends and sometimes use sails -- can travel upstream |
| steamboat | a boat powered by a steam engine that turns a large wheel |
| freight | transported goods on a boat, train, or truck |
| barge | a large, flat-bottomed boat used mostly on rivers and other inland waterways |
| paddy | a field of rice |
| deforestation | the clearing of forest land by cutting down trees |
| consequence | what happens because of an action |
