History gives us information on how other people live. We can learn their lifestyle , what they eat,hunt,what they used for shelter, what did they use to hunt, ect.
With history we could see things from different perspectives. Image what it was like for the slaves, if we just saw what happened at the "owners " perspective we would probably think the slaves where doing there jobs to just have jobs or to get payed. Bit of you look at the scenario from the slaves perspectives, they went through some pretty bad stuff.