Manifest destiny. They believed it was their god given right to expand westward.
Agencies are usually private and for-profit. Commissions are usually government entities and supposed to be non-profit.<span>
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The declaration of independence was a letter written to the king of England claiming that the 13 colonies were free. It also stated that no acts of tyranny would be tolerated.
Korea lies on the Korean peninsula between China and Japan. It's location could lead to increased trade between the countries.
Basically one involves the whole country and is more complex while the other only affects the state of Massachusetts.