What is the difference between the Declaration of Independence and the Constitution?

Declaration of Independence, signed in 1776, was pretty much just what it says it was. A formal declaration by the original 13 colonies that they would now be independent of King George and Great Britain. Except for being persuasive authority as to the intent of the framers, the Declaration of Independence is NOT the law of the land. On the other hand, the Constitution was adopted in 1789 and is the principal law of the United States federalist system - and it is the law from which all other laws in the United States is derived. If an individual state passes a law, it has to conform to the United States Constitution. If the Congress passes a law, it must also be in conformity with the minimum Constitutional guarantees of liberty or risk being struck down by the courts as being unconstitutional. (See Marbury v. Madison)