As a non-European I'd like to read more. What exactly should I be googling to get the real history and not the clean history that is commonly told?

In some countries yes, others not. Nobody got killed to make Nordic countries ”ethnostates”. It’s just that not that many people wanted to live so far north.

In fact, in Finland the largest ethnic minority (Swedish) on average do much better than ethnic Finns. Sami minority got discriminated admittedly, but not violently persecuted.