In a multiple regression analysis, the following correlation matrix was computed. 
Which independent variables are highly correlated with the dependent variable?
Definitions:
Trade
The action of buying and selling goods and services between entities or countries.
Westward
Referring to the direction or movement towards the west, often associated with the expansion of American settlements.
Cheap Land
Land that is available for purchase at a relatively low cost, often enticing settlers and investors to new areas or the frontiers.
Appalachian Mountains
A mountain range in the eastern United States, running from Canada to Alabama, known for its biodiversity and the cultural heritage of its inhabitants.
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