I would gather a top law school could mean regional.Exactly.
As I understand it, Top Law School refers to any well regarded school (i.e. T1). However National Law Schools are those whose brand extends beyond the region. For example, Washington & Lee is a fairly well ranked law school, but hardly anyone outside the greater Lexington, VA region has heard of it. It would, imo, be a Top Law School but not a National Law School.
National Law Schools would include H/Y/S, Columbia, NYU, Michigan, Chicago, Georgetown, UCLA, Penn, Northwestern, etc. Some might consider IU-Bloomington to be more of a National Law School than NYU because most IU grads do NOT ultimately practice in Bloomington whereas many (a majority of?) NYU Law grads stay in NYC. Make sense?
I would consider all national law schools to be top law schools but not all top law schools to be national law schools. However, I think that depends on how strict the definition of "top" is. I don't believe Ave Maria would be considered a national law school because it's not highly regarded. Notre Dame would be, but because of its strong brand, not because it's a Catholic school. HBCU... not sure. Howard has a good brand, and firms like to boast diversity, but I haven't really looked into it b/c I'm white.
...k, just checked website of the BigLaw firm I used to work for. There are a handful of Howard alumni working as attorneys, at least half of whom summer'ed there. All but one are in the DC office, though, so it's hard to say how much is regional. Still, Howard fares better than other T3 schools at my old firm. For example, the only NYC law schools they recruit from are NYU, Columbia and Fordham (all T1). They used to recruit from Cardozo (ranked around 50th) but not so much now.
Which other HBCU have law schools?