There had been revolutions prior to the American Revolution. But this was the first time a group of people outlined in writing (the Declaration) the reasons they were revolting and declaring that they were an independent state (nation).
... He [the King] has refused his Assent to Laws, the most wholesome and necessary for the public good. ...
The Declaration of independence was based on a document written by George Mason. It was The Virginia Declaration Of Independence.
Many things led up to the Revolutionary War in America, but the last straw was the "Intolerable Acts" and British pressure in Massachusetts.
The declaration came first.
The Declaration of Independence document can be used to argue for quitting. The Declaration of Independence document is used only for Theory and Natural rights.