You should read about the experiences of African Americans. Many cultural facets and political tensions held over from slavery are alive and well.

Financially, income inequality in Sweden is vastly lower than in the United States as it is, and in the United States much of the inequality falls on racial boundaries. A recent Federal Reserve Bank of Boston study found that local white household’s median net worth was $247,000 while for African American households it was $8. Yes, eight single dollars. The Black population in Boston has been well established for well over a century, and much of its white population came in waves of western European immigration in the early to mid 20th century.

Not talking about this problem hasn't solved it so far because systemic self-perpetuating inequality doesn't just go away if you ignore it.