I look around this morning at the Class of 2015, and I have to tell you that all I see are doers.Which is good because, in years to come, there will be much for you to do -- both here at home and overseas.I am keenly aware that commencement speakers have a habit of ticking through the world's problems,and then challenging graduates to fix them. And yes, that is what I plan to do.But when I tell you that the world needs you, I really, really do mean it.For we are living in a time that is more unsettled, more complicated, and more in need of a new generation of leaders than any that I can recall.At home, America's great challenge will be to retain a sense of community and common purpose.As today's graduates reflect, we are a diverse people.We're all proud of the distinctions that gave us our separate identities; and loyal to the groups to which we belong.This kind ofsolidarity is a means of honoring ancestors and a way to inspire the young.It makes us feel less alone, and helps us find for ourselves a unique place in a crowd.But there is also a danger; because when pride in "us" descends into fear or hatred of "them,"the American tapestry unravels and the social fabric is torn.
