This race of humans with white coloration consisted of people who left Africa and migrated to very cold and inhospitable regions with a lot of snow and fierce winters. They had very little genetic variability as their gene pool was derived from only a small number of migrants from Africa. They developed very aggessive and warlike behavior and, for a time, dominated other races.
Their aggressivity, combined with high technology, almost made earth ininhabitable.
Fortunately, their numbers were relatively small and they were ultimately absorbed into other races of humanity. It did not take long. Their existence as a race lasted only about 15,000 years.
No one seemed to mourn their demise.