Singapore is diverse country of many cultures and they clearly figured out.
Problem is US - smart people dont go into politics, smart people self-select into high paying industries like tech or high frequency trading, and the local city/state politicians are mostly liberal arts types, who are not familiar with STEM or are plain ideologues with their own agenda.
what is lacking in the US is political will to solve problem and too many decentralized decision makers who are not on the same page.
District attorney may be prosecuting criminal, but then judge just lets him loose back on the streets - like what happens to hondos in San Fransicko
Do you believe that people with different cultures/races cannot agree on a system of fair laws?