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I use Hierarchal but keep it to one sublevel. Going to many levels resulted for me in duplicates.
For example I might have History.18th century.Quebec. Canada and History.Canada.Quebec.18th century.
No harm done but it irritated me and made data entry and sorting more cumbersome.
For you History is probably redundant as they are all history.
I would start with top category as time or country followed by the other. Then I would put single tags in the same field or another, designating culture, specific area, and things like political, military etc. At some point you will be done, or so I keep telling myself, and it will be easy to sort groups and assign a secondary hierarchal group if it seems desirable.
Helen
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