1 - General Whole World 2 - Specialized Countries or States 3 - General Geographical Groups 4 - General Single Countries or States (Non specialized) 5 - Postal History 6 - Topical Subjects (Thematic) 7 - Air Mails 8 - Specialized Single Issues of Countries or States
My observation is that as more stamps became available over the years, people shifted their collecting interests, with everything else picking up the slack left behind by one-time and/or would-be world wide collectors. When it all gets to be too much, people naturally divide up their interests and specialize.
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