....Obama returns to an outwardly thriving New Orleans Thursday to mark strides 10 years after Hurricane Katrina. But underneath the visible recovery lie persistent racial and economic inequities that haven't receded.... ...according to one analysis, African-American households in the city earn more than 50% less than their white counterparts -- well above the national average. Those barometers of racial inequality aren't unique to New Orleans, and haven't dampened the city's enthusiasm for what has otherwise been a steady recovery that includes new construction, jobs and visitors. But the now-chronic gaps between rich and poor, and whites and blacks, were poised...