For what percentage of our time on earth have humans been uniquely gatherers and hunters? why have historians tended to ignore the long paleolithic era?

Which areas where seperated by the iron curtain

Who was the last of the "good empire" a: commodus c: marcus aurelius b: trajan d: julius caesar

Who were the copperheads? a. a native american tribe that rose up during the war b. northern democrats opposed to the war c. ships that ran the union blockade d. an elite force of union soldiers in the west