Since so many of our presidential candidates favor "open borders", the public should be aware of what has been happening in Europe. The link below is a sobering description of what could happen in the US.
Europe has opened its arms to "refugees' from far-away countries, such as Pakistan, Somalia, and the M.E. .That's the "legal" part of this mass-migration. However, Europe also has a problem with "illegal immigration"
"..."Between 2014 and 2017, ...[snip]... recorded more than 2.5 million detections of illegal border-crossings along several land and sea routes, an historic, mostly unfettered surge....."
Among this influx of migrants are terrorists. "...."Of the 104 migrants implicated in terrorist acts, 29 were involved in 16 completed attacks inside Europe between 2015 and 2018. These attacks killed 170 people and wounded at least 878 more,"
and from another group, "...Of the 65 migrant-terrorists involved in completed or thwarted attacks, at least 40 appeared to have been purposefully deployed into migrant flows toward Europe, impersonating war refugees, to conduct or support attacks in Europe. ISIS was responsible for this infiltration operation...."
https://www.gatestoneinstitute.org/15290/the-terrorists-migrating-into-europe
The link/study below came from your source/article.
https://cis.org/Report/Terrorist-Migration-Over-European-Borders
Islamist extremists entered European external borders as migrants seeking asylum, or posing as refugees, and conducted and plotted attacks in nine countries. The border entries established proof-of-concept for a previously theoretical travel tactic and provided support for securitizing this migration.
Between January 2014 and January 2018, at least 104 Islamist extremists entered Europe by way of migration over external sea and land borders among more than two million people who crossed external European Union borders. All 104 were killed or arrested in nine European nations after participating either in completed and thwarted attacks, or arrested for illegal involvement with designated terrorist groups.
In all of these cases, the common circumstance was that the actors used illicit migration and later were implicated in specific terrorism activities, such as active plots and successful attacks, as well as past involvements that would reasonably indicate a heightened threat to destination countries.
The majority of the 104 Islamist migrant-terrorists — 75 — were primarily affiliated with ISIS, while 13 were affiliated with Jabhat al Nusra. Others were associated with Ahrar al Sham, the Taliban, Lashkar-e-Taiba, Al-Shabaab, and the Caucasian Emirate. Some had unknown sympathies and some shifted among several groups. Only one was a woman and their average age was 26. They were from Syria and Iraq, but also from North Africa and South Asia.
Between January 2014 and January 2018, at least 104 Islamist extremists entered Europe by way of migration over external sea and land borders among more than two million people who crossed external European Union borders. All 104 were killed or arrested in nine European nations after participating either in completed and thwarted attacks, or arrested for illegal involvement with designated terrorist groups.
In all of these cases, the common circumstance was that the actors used illicit migration and later were implicated in specific terrorism activities, such as active plots and successful attacks, as well as past involvements that would reasonably indicate a heightened threat to destination countries.
The majority of the 104 Islamist migrant-terrorists — 75 — were primarily affiliated with ISIS, while 13 were affiliated with Jabhat al Nusra. Others were associated with Ahrar al Sham, the Taliban, Lashkar-e-Taiba, Al-Shabaab, and the Caucasian Emirate. Some had unknown sympathies and some shifted among several groups. Only one was a woman and their average age was 26. They were from Syria and Iraq, but also from North Africa and South Asia.
The dynamics of the threat to the US are different.........especially with a huge ocean between us and the terrorists.
While we have more illegal aliens coming thru our Southern border, the vast, vast majority are migrants looking for work from Central America.
Almost none of these people are terrorists, unlike the ones coming from the Middle East who can easily reach European countries to the north.