Independence. Its primary author, Thomas Jefferson, wrote the Declaration as a formal explanation of why Congress had voted on July 2 to declare independence from Great Britain, more than a year after the outbreak of the American Revolutionary War, and as a statement announcing that the thirteen American Colonies were no longer a part of the British Empire. Congress issued the Declaration of Independence in several forms. It was initially published as a printed broadsheet that was widely distributed and read to the public.
Philosophically, the Declaration stressed two themes: individual rights and the right of revolution. These ideas became widely held by Americans and spread internationally as well, influencing in particular the French Revolution. Hope that helps:)