It’s a precomputed hash that let’s you know if an item is (kinda) in a set or not. Fast and uses up very little space.
Counterpoint, Hawaii is a huge melting pot but has the highest life expectancy among US states. Australia also has many immigrants. People are not turning against each other.
But Hawaii has a large percentage of Japanese and Asian descendants. So to me we need to separate the data by ethnicity. DNA, culture, and food preferences has a high impact.