How does the UDHR (Universal Declaration of Human Rights) differ from an international agreement or a “statement of law”?

Why is the supremacy clause considered to be the root of federalism?

Which of the following is a polynomial with roots 3,5i, and -5if(x)=x^3-3x^2+25x-75f(x)=x^3-3x^2+15x-25f(x)=x^3-15x^2+25x-75f(x)=x^3-3x^2+15x-75

Which of the following powers is held only by the federal government? a. power to make a treaty b. power to set marriage laws c. power to create driving laws d. power to set the legal drinking age