What document is referred to as the supreme law of the land?

The Constitution is referred to as the supreme law of the land because it establishes the framework for the government of the United States and outlines the rights and responsibilities of the government and its citizens. Specifically, Article VI of the Constitution states that it, along with treaties made under its authority, shall be the supreme law of the land, thus overriding any conflicting state laws. This principle enshrines the Constitution's authority, making it the highest legal authority in the country.

In contrast, the Declaration of Independence is a foundational document that proclaimed the colonies' separation from British rule and expressed the ideals of liberty and equality, but it does not serve as a governing framework or law. The Federalist Papers are a collection of essays written to promote the ratification of the Constitution and discuss its principles but are not legislative documents themselves. The Treaty of Paris, while important in history for ending the Revolutionary War, does not hold the same legal status as the Constitution and is specific to a particular event rather than serving as a governing document.