In answering this question, it's important to understand the importance of the Declaration of Independence's overall rhetorical strategy. It was written primarily to persuade Americans who might otherwise be skeptical at the very idea of independence—that this was the only way forward. It was also written with the intent of persuading the rest of the world that the American colonists had been unfairly treated at the hands of their colonial overlords and that this why they had decided to bite the bullet and declare independence from Great Britain.
In general terms, the Declaration expresses the colonists' conviction that they'd been pushed into a corner by the arrogance and intransigence of the British and therefore had no alternative but to declare independence:
Such has been the patient sufferance of these Colonies; and such is now the necessity which constrains them to alter their former Systems of Government. The history of the present King of Great Britain is a history of repeated...
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