Lashes over Muslim minorities in Europe throughout the past ten years

These were part of the instructions on the assignment instructions given to us: You can compare political/ economic developments over time in a single country (e.g. clashes over Muslim minorities in France in the past 10 years;)”
Instead of making the topic so narrow (like only focusing on France), I decided to open it up to Europe in general. So if you can explain the clashes and then possibly answer what was the main hinderance/conflict between the societies (or something along those lines) that would be great