This week, our Mainstreet reporting team looks at Minnesota's 'hidden' population -- rural minorities. In some cities and towns, the minority population has just begun to grow. It's a change that enriches life for some, and threatens others. It's been nearly three years since the start of a series of racially motivated conflicts in Rochester. The violent clashes mainly between white teenagers and immigrant Somalis marked the city's awakening to deep racial divisions some say had been kept hidden below the surface. Since then, youth groups promoting cultural understanding have grown, minority groups have found a stronger voice, and city leaders launched an on-going education campaign. Still, Rochester residents of color say it's been a challenge to establish even a basic understanding with their white counterparts.