New Hampshire’s colleges and universities say they are trying to foster greater diversity, but they’ve had limited success. Black student population at the University of New Hampshire, Plymouth State, Keene State and Dartmouth totaled 550 in 2010. In 2019 it was 570, a tiny number compared to the overall student population of 24,465 at the four schools. Cost and existing lack of diversity in the state are challenges; story discusses options for what schools and state can do to change this.