What five questions of history do historians attempt to answer?

Second roman invasion on Britain? What was jagirdari system? What is ruby's mineral group? How many pages does Personal Recollections of Joan of Arc have? How many miles of roads make up the roman roads? What were American cultures and politics from 1945 to 1960? Which sentence is grammatically correct you are on war or you are at war? What states had slaves but didn't leave the union during the civil war? How does the cocoa bean turn to chocolate? What changes to byzantine society did Theodora help bring out? Excluding the USS Constitution what ship is the oldest vessel still commissioned in US navy? Did Bernard de Galvez stole clothing guns medicine and food from the American Revolutionary war effort.? A nerve gas attack has occurred in one of the city's underground subway stations. This is the second attack this month.? Why were the Native Americans so important during the French and Indian war? What awards were given to athletes at the first olympic games and what awards are given today? Who established settlements and claimed land first? Was Jefferson Davis racially prejudiced against Beauregard? How did Americans experience under the british rule influence the form of government they establish under the Articles of Confederation? When did the french aid in the American revolution? How did the impact of the American and French revolutions on two Latin or South American revolutions and their leaders. Provide evidence to back up your argument.?