There are 65 million people worldwide that are now considered refugees.
The U.S. has taken in 650,000 just from the SIX WORST, MOST FAILED nations in the world since 2006 and European countries have taken in far more. Germany, for example, took in about 1,300,000 in the last two years.
The U.S. took in about 40,000 Muslims last year. That was about half of all that we took in from all nations.
U.S. admits record number of Muslim refugees in 2016 | Pew Research Center
Six countries named in revised Trump travel order accounted for more than 650,000 U.S. entries since 2006 | Pew Research Center
I'd call that a flood.
You say there have been problems........well, that means that there are enough problematic people to cause problems.
That means there is a problem. I don't know about where you are, but we have a HELL of a problem with Somalis in Minnesota (where they have taken advantage of "Minnesota Nice" to "Flood" in and as soon as they do get in they then immediately, send for, and bring, every possible cousin, uncle and grandpa with them).
We don't want them.......but they're now increasing faster than they can be counted and the government is forcing them upon us.
Relations between natives and Somalians can only be described as ugly and hostile and it's getting worse. Not only a drain on taxpayers, but forcing people to live in constant fear of acts of violence.
https://www.google.com/search?q=Somali+problems+in+St.+Cloud&ie=utf-8&oe=utf-8