A lot of divisions in America are driven by generations of policy based on racism - from redlining, white flight and zoning policies that changed the structure of cities and are now used as weapons against newcomers and change, to the very existence of many cities and governments that were created in order to be a separate white space from the larger cities nearby, and the use of these boundaries to avoid funding the basics of society for everyone (school districts, libraries, roads, etc).

The vast majority of Americans are not racist in the sense that they are personally antagonistic to an individual of another race. But many of them are racist in the sense that they think black people on average are poorer because they have shitty culture, not because white people historically prevented them from buying land, prevented them from being educated, prevented them from using opportunities like the GI bill, etc.