Without more context about the story "The Swimming Contest," it is difficult to provide a specific interpretation of what was lost and how it relates to the historical conflict between the two people groups represented in the story. However, based on the information provided, it is possible that the author wants readers to understand that the conflict between the two groups has resulted in a situation where everyone loses, regardless of who wins the swimming contest. This could be a commentary on the destructive nature of conflict and the need for cooperation and understanding to resolve differences and promote peace. Alternatively, the use of the word "losers" could be a commentary on the arbitrary nature of competition and the idea that assigning winners and losers can be a limiting and divisive practice. Again, without more information about the story, it is difficult to provide a definitive interpretation.