A couple of different races/peoples constitute this country This country comprises a couple of peoples. This country consists of a couple of peoples.

Constitute: constitute is used when talking about something that is a part of a whole ex. "nine players constitute a baseball team" but in the past tense, comprised, it can mean to establish or create ex. "laws are constituted by the government" Consist: consist is used when describing what some is composed or made up of. Mostly used when talking about objects and or processes. "The project consists of five phases" ex. "My day consisted of school and work" Comprise: comprise is very similar to consist. It is used when describing what something is made of. Comprise is widely used in scientific field. ex. "The computer system is comprised of 280 parts" Hope this helps a little