The one example that President George Washington uses to explain that all parts of the nation work together and are equally important is the dependent relationships between the North and South East and West, which has made each part of America interested in the Union.
The North depends on the agricultural produce of the South to fuel its manufacturing activities. The South cannot produce more without the ready market provided by the North.
Thus, all parts of America depend on one another and are interested in the United States.
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