It is not that fucking simple---
Then explain to me why the US has an influx of brown people from Guatamala, Mexica, Honduras, etc,--creating a migrant crisis in the US We are not destroying those countries with either economic power or military might.
People flee their own countries without US interference because of corruption, fear of harm or death, from within their own countries, or for better opportunity--and it may have happened or been happening already without any US involvement in the countries you mention. It is definitely the reason that those people are trying to enter the US illegally--at least that is what is reported.