Arianna attended the 2011 National Council of La Raza (NCLR) on Sunday to deliver a speech on upward mobility and the immigrant experience in America.
"In the preamble of the Constitution, we are told that we are constantly moving towards a more perfect union," she said. "This country is based on the promise that if we work hard we are going to do better, and our children will do better still."
But Arianna warned that "It's that promise of upward mobility that is now at risk. America is now tenth in upward mobility, behind the Scandinavian countries, behind Spain, behind France."