How are timelines useful for studying history?

When was the last time China was in war? Why was alphabetic writing invented? What events did they do in the old days? Is robbie keane Celtic fan? Did queen Mary wife of king George V wore a wig? Is there a place called gravy on the world? What is the Ancient Greeks achievements of government? What does osiris's name mean? When did DinoSquad end? Who are some people that helped Bessie Coleman succeed in life? What were the countries in the Korean war fighting for? Is Madison burr related to arron burr? What are the eisenhower doctrine? What were the Shell and Gas attacks like in the trenches? Whose was first signature to appear on the declaration of independence? What happened in 1863 after president Lincoln issued the emancipation proclamation? When was the us navy established? Why were the audience members confused when they saw John Wilkes Booth leap from the president's box onto the stage? How did people get all over the world? Which country was ruled by King Hussein from 1953-1999?