The U.S. recorded the most deaths in its history and the fewest births since 1998, resulting in the lowest population gain from natural causes in 35 years, an analysis of 2013 Census Bureau estimates released Thursday shows. Americans remain cautious about having babies following the worst recession since the Great Depression, although they are increasingly changing residences again, suggesting growing confidence in the economic recovery. Those are among the findings from county-level data that also show the largest metropolitan areas are getting bigger as much of the rest of the nation sees slower population growth or declines. Rural areas where...