What is the constitution of the u.s?why is it referred to as a living document?what does supremacy clause mean

Question

and why was the bill of rights added?

Answer 1

The US Constitution is the fundamental document that establishes the structure and powers of government for the USA (with checks and balances), ever since 1789.  It is referred to as a "living document" because it has an amendment process, and because social activists and others can invent new "rights" that don't exist in the text (for example, the so-called right to privacy).

The supremacy clause establishes the Constitution, Federal Statutes, and US treaties as "the supreme law of the land."  That is to say, the Federal government, and not the states, is the ultimate authority.

The Bill of Rights was added to get other States to ratify the Constitution.  They feared (rightly so) that an ever increasingly powerful government would take away more and more rights of the people, and become destructive of the ends for which the government was established.  Others thought that it was absurd, because it was "obvious to anyone" that the individual rights were clear, and needed no protection.

Imagine for a moment what sort of state we would have today if there had not been a Bill of Rights.

Answer 2

its a living document b/c they feed air in its enclosure at the Lincoln Memorial. yes it needs air to stay "living"