A recently released study said the wealth gap between nonwhite and white families has increased by $40,000 since the March on Washington took place on Aug. 28, 1963. The study was conducted by the Federation of Protestant Welfare Agencies, an anti-poverty, policy, and advocacy organization based in New York City. The organization’s CEO, Jennifer Jones Austin, said the gap is disturbing, noting the observance of a day — July 23 — dedicated to African American women workers getting their fair share of pay.