From Grok concerning correlations:

Crime

Multiple studies find that higher racial-ethnic diversity or lower White population share correlates positively with violent crime rates (homicide, assault, etc.) across U.S. states and counties. White population percentage often shows a negative correlation with violent crime, while Black and Hispanic percentages show positive ones.

Social Trust

Robert Putnam’s research (and subsequent meta-analyses) finds that higher ethnic diversity is associated with lower social trust, lower altruism, fewer friendships, and reduced community cooperation—residents of all groups tend to “hunker down.” This pattern holds more strongly at local scales and for trust in neighbors. Lower social capital can indirectly relate to weaker informal social control and higher crime risk.