Why is Harappa culture so mysterious? How do we know they had a government, what is the evidence?

Brainliesttt !me : ) what brought about the end of the soviet union?

Why are nation-states difficult to create?

How does the supremacy clause of the u.s. constitution affect the states? o a. it requires each state to establish a supreme court. b. it declares that the federal government can take away state powers if necessary. o c. it allows state governments to overthrow the federal government if necessary. o d. it ensures that the u.s. constitution overrules each state constitution