This appears to be a viable solution to stem the tide of migrants on the southern US border, rather than building a wall to prevent migrants to the US.
https://www.yahoo.com/news/marshall-plan-central-america-restore-090014894.html https://www.yahoo.com/news/marshall-plan-central-america-restore-090014894.html Julian Castro suggested this idea. And it may turn out that he would lead the Democratic pack in opposing Trump for the next election.