George, I think it's naĂŻve to state that "tolerance between black and white Americans in 2008 is hardly unusual". It certainly is in parts of the country. Watts comes to mind. It's dangerous to make assumptions.
Your example of a black Southern Baptist church and a Hispanic Iglesia sharing a picnic doesn't strike any sort of reaction in me because it was commonplace where I grew up in Southern Cali.
I'll say again, I think we should refrain from telling a photographer that their view of society is not as good as our own. That's silly and rather arrogant.
CJ
A black Southern Baptist church does not exist in SoCal! Never can, and never will. Yes, a black Baptist church might - but not a "Southern" Baptist one!
"The South" is a geographical place. Real dirt, on the ground. It bascially is composed of those states which lie below the Mason-Dixon Line and which rebelled against the Federal government in 1861.
It is unique and both fascinating and frustrating at the same time. It gave us William Faulkner, Eudora Welty as well as Jim Crow and George Wallace.
As to the point of documenting the "changing South" in the 21st Century:
With the exception of Florida, where the in-migration of Cubans first occured in the early 1960's (following the revolution there) and who were later followed by other Central and South American latinos, "The South" has been late to the immigration wave of Hispanic migration. But is now experiencing a large influx of Hispanics, many are employed in the agribusiness sector (particularly pork processing plants) . These immigrant are often perceived by black Americans in the region as an economic competitor.
The irony of this is that most of the jobs filled by the immigrants were going for the begging because many lower income Americans in The South, both black and white, consider such labor to be "beneath" them!
Simply put, it is a situation of the lowest guys on the economic ladder filling a vacuum in the labor market.
So a "telling" documentary photo would show either the tension between these groups (a negative image - to be sure) or one that shows "cooperation" as in my hypothetical church picnic (a "feel good" positive pic).
More largely, it's sad enough on this site how people from tiny, nearly homogenous countries in places like Europe try to compare their insular experience to that of a continent-wide nation that is the most diverse on the planet. Why anyone living in this amazing polyglot would try to make it seem narrower rather than broader is really depressing.
If you want "documentary" or "newsworthy" pics of blacks and whites together you can find them every day in the newspaper. Just look at the photos shot at Obama's or Clinton's or Edward's political rallies!