The cause which was lost was the "consent of the governed" as outlined by the Declaration four score and seven years before the idea was expectorated by the government who's foundation it was.
The Declaration gives all people the right to be independent and to form a government that suits their interests, you know, the way the 13 slave owning colonies did.
Canada was the smart one. They never joined in the first place.
Nothing in the Declaration of Independence says or implies that if you provoke, start and formally declare war on the United States, you must necessarily expect to win.
Why would such a simple concept be so difficult for DiogenesLamp to grasp?