Final answer:
The literary device that supports the author's purpose is repetition.
Step-by-step explanation:
The literary device that supports the author's purpose to show what has led to the refugee crisis is repetition.
In the excerpt, the author repeats the idea of addressing the root causes of violence in Honduras and the demand for illegal drugs in the United States. This repetition emphasizes these factors as the main causes of the refugee crisis.
By using repetition, the author reinforces the importance of understanding and addressing these issues to effectively address the flow of children seeking refuge.