Just before the 2010 Midterm Elections, a CBS News poll found that black Americans were more likely than whites to express optimism about the economy. And while nearly 50 percent of black Americans thought America’s next generation would be better off, only 16 percent of white Americans thought the same. In the wake of the worst economic downturn since the Great Depression — a downturn that most experts believe affected minorities more than whites — African-Americans had an optimistic outlook. What accounts for this optimism? Ellis Cose answers that question in his new book, “The End of Anger: A New Generation’s Take on Race and Rage.”