The authors of the declaration by made the deductions by making it known in their writing that the reason why the colonists must form their government was based on the need to end the evils they had experienced the British government.
This is the type of reasoning that helps bone to arrive at conclusions based on certain logical premises.
The reasoning here is based on the fact that they have being treated badly by the British, so the wise thing to do would be to stand on their own.
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