12. Monaco
Years of independence: 594
This small country, next on the list of oldest countries and nations in the world has a population of 30, 645 people, out of which 55% are immigrants, according to UN data in 2015. The biggest ethnic group is French with 47%, then Monegasque and Italians with 16%. The official religion is Catholic, but there are also many more because of the diversity of the population, of course.
Pixabay/Public Domain
