Under Construction: A recent survey of Americans found that fewer than half believe the U.S. has made substantial progress toward racial equality. Here, the Martin Luther King Jr. Memorial in Washington, D.C., is boxed in by scaffolding as work is done on it. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

Question 9 on the first page of the 2010 Census form. After more than a century, the Census Bureau is dropping use of the word "Negro" to describe black Americans in its surveys. Instead of the term, which was popularized during the Jim Crow era of racial segregation, census forms will use "black" or "African-American." Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

The crowded scene on "Black Friday" at Macy's in Manhattan. The U.S. population is projected to hit 400 million in 2051, Census says, up from 321 million in 2015. Stan Honda /AFP/Getty Images hide caption

itoggle caption Stan Honda /AFP/Getty Images

Obama supporters react as President Barack Obama was declared the winner Tuesday, during the Nevada State Democratic Party gathering at the Mandalay Bay Resort and Casino in Las Vegas. John Gurzinski/AP hide caption

itoggle caption John Gurzinski/AP

President Obama signs the Affordable Care Act in the East Room of the White House on March 23, 2010. Data suggest that racial attitudes of ordinary Americans shape both how they feel about the health care overhaul and how intense those feelings are. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images