Which of these is the best definition of an era?* A period of time identified by political, economic, or social trends
A series of various changes over many years
A series of events unified by individual or organized protests
A period of time lasting between 10-15 years

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