What is the book of US

The Constitution of the United States (or U.S. Constitution)[a][b] is the supreme law of the United States. It originally consisted of seven articles, whereof the last three have since been superseded. The first three articles embody the doctrine of the separation of powers, whereby the federal government is divided into three branches: the legislative, consisting of the bicameral Congress; the executive, consisting of the President; and the judicial, consisting of the Supreme Court and other federal courts. Articles Four, Five, and Six embody concepts of federalism, defining the rights and responsibilities of state governments and the relationship between the federal and state governments.

Although the Constitution underwent extensive revision during the Philadelphia Convention in the summer of 1787, it largely retained the form of the earlier Articles of Confederation. Drafts of the Constitution were reviewed by state ratifying conventions in early 1788. The Constitution was subsequently amended several times, with the most recent addition being the Twenty-Seventh Amendment in 1992.

The Constitution is widely regarded as one of the most influential documents in American history and has been studied around the world as a model of constitutional government. It has also been the subject of heated debate, particularly in recent decades, over the scope and interpretation of its various clauses.