Answer: Race: a grouping of people into groups that are typically perceived as separate within a given society based on similar physical or social characteristics.
Ethnicity: a collection of individuals who identify as a group due to similar characteristics that set them apart from other groups.
Nationality: a person's official identification as a subject or national of a sovereign state under international law.
They are all the same because it's a way for people to identify themselves as well as all of them having their own individual communities. They're different because they're all different types of identification. Someone can be of different ethnicity but the same nationality.
Step-by-step explanation: