A rapidly aging white population and fast-growing younger minority groups are speeding demographic changes across the nation, hastening a political divide likely to have long-term ramifications.  The percentage of the U.S. population that is white has decreased from 79.6 percent in 1980 to 61.9 percent in 2014. The percentage of Latino-Americans has increased from 6.4 percent to 17.3 percent over the same time period, while both the African-American and Asian-American populations have grown, too. There are growing signs that the rate of change is increasing. The number of non-Hispanic whites who died in 2014 outpaced the number of white births in 17 states, according to a new analysis from the University of New Hampshire. That’s the largest number of states to experience a natural decrease…