Category talk:20th-century American people

Why so few subcats?
Why are there so few subcategories here? E.g., why no 20th-century American sportspeople, 20th-century American journalists, etc., etc.? — SMcCandlish  Talk⇒ ʕ(Õلō)ˀ  Contribs. 05:22, 20 July 2010 (UTC)
 * Just create a subcategory and then start adding people in. For example,I just made Category:20th-century American mathematicians and added Charles Roy Henderson. Senator2029  “let's talk”  19:29, 16 November 2012 (UTC)

is this truly tagged properly?
why is this tagged "container category" as opposed to "category diffuse"?--96.232.126.111 (talk) 09:55, 28 April 2011 (UTC)