What was the purpose in writing the Declaration of Independence?

The Declaration of Independence was written to show a new theory of government, reasons why they were separating from England, and a formal declaration of war. It gave the 13 colonies freedom from England's laws. 

Explanation:

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ideological reasons like laws that were made without representation, to define the purpose of government, and to obtain aid from other countries

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a reason that was key to coolidge's victory in the 1924 presidental election was that; democratic party supporters were split in the north and south.