people: A body of persons sharing a common religion, culture, language, or inherited condition of life.
民族有共同的宗教信仰、文化、语言或继承同一种生活条件的人的群体
the peoples of Asia
亚洲各民族
nationality: A people having common origins or traditions and often constituting a nation.
民族一个拥有共同起源和传统的民族,通常构成一个国家
the different nationalities of the India
印度的不同民族
people 和 nationality 都可,指我国的五十六个民族,people可能更合适