The United States is a highly mobile nation. In 2008, 13 percent of Americans moved, though most of these moves were short distances: 66 percent of movers stay within the same county, and just 15 percent leave their state. Until now, we have had little information that we could use in tracking the outcomes over time for families who move, and even less that allowed us to understand the dynamics of the places families left and joined. A new report, relying on data on ten low-income neighborhoods from the Annie E. Casey Foundations Making Connections Initiative, allows just that. And the findings are striking.