Right, so Germany is still what, 90% White? They've a long way to go before the Weimerica levels.
Comparisons with Germany will always be somewhat pointless.
In 1990 during reunification Germany was almost entirely European and
almost almost entirely German, except for a sizeable Turkish population in West Germany.
Even with communism, East Germany was a functional German ethnostate. Ironically, the former GDR, despite Merkel and the CDU being turncoats as “conservatives”, is what has prevented Germany from a fate far worse than France’s right now.
The US as a country has always been under the pump in terms of cohesion and demographics because of slavery (one of the few times slavery can honestly be blamed for something!).
13% of the population is black (and this used to be higher). That
conservatively means America’s European population has always been capped at 87%
at best since the 1700s, probably the 1600s.
1-2% minimum have been Native American (let’s say 2% to account for mixed race European-blacks and European-Amerindians who don’t identify as either ethnicity individually).
So now that’s an 85% cap and one reduced by both mestizo Hispanic migration and higher birth rates from both mestizo Hispanics and African-Americans. The mixed race population should probably be much higher than the 1% I added for safety.
US demographics are bad, for sure, but this issue has been known to all and sundry for decades. The writing on the wall generally has been clear for several hundred years.
Yet the US is still more conservative than Germany. Go figure.
There’s also the geographic barriers Germany has and the US lacks.
Hundreds of people die at sea trying to get to Europe and far less make the attempt than otherwise would due to the Mediterranean. The Arabs also often detest each other based on nationality, impeding access via land routes (plus Israel straddling the coast past the Sinai), and Arabs positively hate Sub-Saharan Africans.
If Europe had a kind of Rio Grande (Ceuta, Gibraltar and southern Spain are bottlenecks that can be managed), Germany would have been overrun entirely by the latest in the 1990s/2000s.