It would be a fallacy to assume that the security of the world would be any calmer had hundreds of thousands of displaced peoples not sought refuge outside of their home nations. I offer it as a speculation that had these masses remained at home, more political upheavals would be percolating today.
Moreover, I venture to predict that in the coming years of restricted immigration, the globe will witness a resurgence in political revolutions and rebellions not seen in recent years.
Therefore, as nations from the United States (US) to the European Union (EU) contemplate enactment of immigration restrictions, careful consideration should be given to the likely demise in world stability once voluminous hoards of people become trapped within their nations having no other means to redress of their conditions, but via revolution and rebellion, which would inevitably impact global investments within the home nations, along with the associated unsure political atmosphere brought to wrought by violence.
Immigration has always been a vehicle to achieving political, economic and social stability worldwide. But if it is severely restricted and prohibited, then its affects could be devastating and not limited to the homes of the displaced, but transcending across walls, mountains, seas and oceans.