Answer:
Self-fulfilling prophecies
Explanation:
This example best illustrates the danger of self-fulfilling prophecies. The country of Superlia only decided to increase its military force because its leaders were worried Piropia would do the same. However, in doing so, they worried the leaders of Piropia, who then ended up increasing their military as well. Therefore, this shows that Superlia, in acting to prevent something, ended up being the cause of it.