context: About 1856, he led his people in relocating to the Omaha reservation in what is now northeastern Nebraska.
source: LaFlesche served as principal chief until 1888.
reference_original: До 1888 года ЛаФлеше занимал должность начальника.
reference_flipped: До 1888 года ЛаФлеше занимала должность начальницы.