That depends on how you define Paganism.
If one wanted to "stretch" the definition, and culture that celebrates and or spiritually identifies with marking and celebrating the natural cycles of life and the earth.
In more general terms, many tribal and shamanic tribes in non-industrialized parts of the world still practice what we in the west would refer to as a paganism of some sort.
Some sects of what is referred to as Hinduism also constitute paganism.
Technically, the celebration of groundhog day and even Christmas is pagan in its origin.
Every country in the world has some form of paganism. The United States and the nations of the European Union (including United Kingdom) have large amounts of pagan citizens.
Modern Paganism in World Cultures was created in 2005.
Modern Paganism in World Cultures has 382 pages.
In most modern cultures, most women are marrying later than they used to. However, there are some cultures where people still marry early.
many African cultures
I think it might be regarded as a form of pantheistic paganism.
Paganism
Are there peculiar ways different cultures or nationalities practice their faith?
All cultures.
Canadians
Yes. In fact many bases are now designating areas specifically for the practice of Wicca and Neo-Paganism.
Paganism used to have a great deal of political power in ancient Greece, Rome and India; but not anymore. If you consider Catholicism as the modern version of Roman Paganism, yes it has some political power in some distant parts of the world.
the ancient germanic cultures