To permanently stem this flow of children, we must address the complex root causes of violence in Honduras, as well as the demand for illegal drugs in the United States that is fueling that violence. The purpose of the underlined phrase in the excerpt is to show that the consequences of violence in Honduras and drug demand in the US

are continuous

Explanation:

The purpose of the underlined phrase in the excerpt is to show that the consequences of violence in Honduras and drug demand in the US are continuous.

The underlined phrase "this flow of children" is actually passing the message that the result of those things that are stated are actually continuous and needed to be stopped. "Flow" means it is pouring continuously. "Flow of children" will mean "the continuous results" - i.e what the violence and illegal drugs continuously result to.

Therefore, the above sentence simply means that to permanently stop the continuous result of what these things are producing, their root cause must be dealt with.

and your question what topic are you in trouble with?

it means that the hockey puck was traveling very fast.