Well, I found some elucidation online. Here are some comments by blacks about the Fourth:
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Denise Rolark Barnes, publisher of the Washington Informer:
"...we [blacks] really haven't - I don't think necessarily bought into the celebration."
http://seattlemedium.com/news/Article/Article.asp?NewsID=89621&sID=3&ItemSource=L
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Comments left on the site of a black person's blog on the issue:
Today as on every 4th I feel nothing. ...I really hate it when people, especially Black people, wish me a happy Fourth.
(Monie)
And like many, I don't feel a stirring on the 4th of July. (Ms. Martin)
We, black folks, operate in cognitive dissonance on this idea of the Fourth. (the uppity negro [sic])
The cognitive dissonance referred to by the Uppity Negro aptly expresses how distressing it is to be a conscious black person in the USA especially on the 4th of July.(dowl)
Well I guess it's unanimous Blacks don't feel any sense of country on the 4th Of July.(freemanpress)
No cognitive dissonance here. Like my Friend said: What's the big deal? It's not my independence day. (JJ)
I'm not a fan of the 4th. As far as I'm concerned it's just another day. (Tamra)
http://blacksnob.blogspot.com/2008/07/born-on-fourth-of-july.html
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Another black person's blog:
I've read about how other black Americans are just as perplexed as I am by the Fourth of July and the annual orgies that seem to mock those of us who decline to join in their hollow celebrations. (Sam Fulwood III)
http://www.theroot.com/id/47117?from=rss
Looks like I cleared up my own question.