And to further your point mass immigration into Europe isn't just recent; it's been happening for decades. For a while the Islamic state was encouraging attacks in Europe, and hundreds of people were killed by jihadists running cars through Christmas parades and similar events which peaked ~2016 and 2017. I think the largest was an attack in Nice, France on Bastille day killing 86 and injuring hundreds (https://grokipedia.com/page/2016_Nice_truck_attack) and another famous one I can think of was the christmas market attack in Berlin, killing 12 and injuring 56 (https://grokipedia.com/page/2016_Berlin_truck_attack). These were the result of economic immigration, unrelated to anything specific the US had done.

Where did the Islamic State come from?

The power vacuum after the US messed up Iraq and Syria. Every single wave of mass migration towards Europe is the direct result of the US choosing to bomb the Middle East. That's also part of why this time around, everybody's quite this annoyed at America.

Also please, use serious sources.