What is an example of periodization in history?

What provides the centripetal force on the barrel of fun? Which scientist discovered the relationship between electricity and magnetism? How does the declaration of independents reflect the democratic ideals of liberty equality and the rule of law? What areas of the US were open to foreign attack in 1814? Why did Germans believe that everything was the Jews' fault? Why money lending was common profession for Jews? Inventions by James naismith? Where is grave of Alexander the great? What is the oldest colony along Spain's northwestern frontier? Was the kitty hawk the wright brothers first airplane? Who defated Napoleon in 1814? What does the "We Can Do It" poster symbolize and represent? How did the US become polarized during the Vietnam war? Where did the Jews go into during and after the Holocaust? When did the education act start? What song contains the lyrics ah ah ah ah I will remember you not the way you laughed but how you lived and what you knew it was on the TV show Children's Hospital Joke Overload episode? What legislation was passed in order to protect African American voters from groups like the kudos klub Klang? Who said Flatterers now brutus thank yourself this tongue had not offended so today if Cassius might have ruled? How do unlock cao cao's horse? What does the war of terror signify?