What desert did Marco Polo have to cross to reach china

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

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

The had established a temporary government only 3 days earlier