What case do Nigerian activists make for the bronzes being returned to the possession of Nigerian museums & other cultural institutions?

The Nigerian activists argue that the artifacts belong to the Country in terms of their origin.

Explanation:

The Nigerian activists have been very defensive about their culture and the artifacts that were taken to Britain during the time the nation was colonized and ever since the day have been kept there.

The argument is that the artifacts are native to the country and an integral and inseparable part of its life and culture.

It is only valid that they be a part of the country and not be kept somewhere they are not to be valued as much as they could be at home.