Germans mostly assimilated and culturally were similar to existing Americans, sharing the same religion and similar values. Can’t say the same for Muslim immigrants at all.
What about the Irish in America then? Culturally, they were not Protestant and were regarded as very different for a long time. How come we don't hear about this as an issue in the US today?
They had a tough time integrating but ultimately they were Christian and European and had western values. Muslims don’t have any of that and their ideals of freedom amd rights aren’t compatible with western values.
Current net immigration inflows into Germany are below 0.5% of population.
The big immigration waves of the last 20 years can be directly linked to devastating wars: Afghanistan, Syria, Ukraine.
How many generations did it take for the Germans to become Americans in the US? Did it make Americans disappear?