What is, on a controversial issue, one side is presented with sources, and the other side is not mentioned at all or given just a brief overview?

This often happens on Wikipedia, even when the editors aren't trying to be biased. Suppose there was a dispute between the British Empire and a small tribe in South Africa. The British side of the story will have a lot of sources, most in English. The tribal side will most likely be known only to locals, with maybe some articles in Zulu and one in Dutch. How do you think the Wikipedia article will look?

To be fair, Wikipedia is trying to enact policies to address such biases, but there is still a lot of work to be done.