The Declaration of Independence is the document referring to the time when the US was founded, we can consider this document as the founding document of the country, as through it the country can completely detach itself from British rule. This statement was approved by the Continental Congress on July 4, 1776, and has in its text the genius of Thomas Jefferson.
Regarding the structural declaration of independence, we can state that the body of the declaration acts as an implicit plan of action, since the laws and practices discussed therein were written in a proposition but not formally expressed; not manifestly stated and subject to change.