Histories? Plural?

Before reading last week's assignments, I was aware that there are individual histories, national histories, and a world history, of multiple events and interactions. But I was blown away by all the different types of history they created out of thin air, or so it seemed. For instance, why is there a need to differentiate between social history and intellectual history? Intellectual histories are defined as written histories that focus on the development of ideas so why can't that just be out into its respective categories of developments under national history, family history, etc. I felt as if creating all these sub groups just confuses and complicates the idea of history considering that most elements overlap anyway. This point is especially evident in the idea Weaver presents about the iceberg of culture v. customs and attitudes. Histories are made up of behaviors, beliefs and values and thoughts that influenced people's tendencies at which they eventually overlap somewhere. So can't we just combine diasporic histories with certain culture histories or socieconomic histories?
Furthermore as Hall brings up about context and information being functionally related, histories include these and so you cannot explicty distingush between them, especially when considering that it is very difficult to exclude context. And I personally believe that the power in history M&N touches upon in texts and other histories, etc..is more powerful when we look at all the histories together. If you look at them separate it is easier to forget the implications and influences they had on each other. I think that separating histories in an acadmeic sense also fosters segration between groups of people, which isn't a usefool ideology to have floating around because there is more power in numebrs and unity then individuals standing alone. Which bring up the contact hypothesis of better communication between groups of people is faciliated by bringing them together and allowing them to interact. I don't necesarily agree that it is so simple as that, but I so believe that it important for them to interact so that they understand their differences and no avoid them or see them as negative aspects.