A version of this piece originally appeared on the Rockefeller Philanthropy Advisors website. FEMA trailer camp, Plaquemines Parish, La. Photo: Marni Rosen The many communities of color along the Gulf Coast, be they African American, Creole, Native American, or Vietnamese American, have much in common -- and not just because they're still struggling to get back on their feet after Hurricane Katrina's 20-foot storm surge flooded them in August 2005. These communities have been systemically marginalized for years, and Katrina and Rita only accelerated the process. Their land is literally on the verge of disappearing, whether through coastal erosion, urban …