How did the Nazis figure out whether a person or community is 'Aryan' or not?

If the Nazis wanted someone to be “Aryan”, they made up some cock and Bull story to justify it. If they wanted the opposite, they could be equally inventive in assigning someone to “Untermensch” status.

Nazi racism was not actually scientific, it was just a load of bullshit with a thin patina of “science-y” garwharbl to justify what was basically a totally ideological belief.

And then we get sexy time with them!

Why do Indian parents force their kids to do stuff?

Poles are “ugly, subhuman Slavs” but hey, Hermann, have you noticed how hot and blond those leggy Polish chicks look? They don’t fit our “subhuman” model at all! İn fact, they kind of look like our Aryan ideal personified!

And then we get sexy time with them?

They used their “spidey sense”.

From an axiology/value theory point of view, how can one say that a diverse society is better than a uniform one, especially given the negative effects of diversity (racism, sectarian conflict, problems arising from extreme cultural relativism)?

It was all bullshit the Nazis made up as they went along. Trying to cast it in real scientific terms is a waste of time.

Ja, well, Helmut, it’s very simple. Those hot leggy blondes are actually not Slavs at all but are, in fact, Aryans who got Slavicised. We need to rescue them from the pit of subhumanism that surrounds them by immediately giving them Aryan status!

Ultimately, what made a group of people “Aryan” or not came down to how much they wanted them to be “Aryan”.

What trains transport cars and passengers near Pompano Beach, Florida that goes to New York?