What is the historical reason for this? I have seen some people

>>3312883
It's cause of segregation, white people didn't integrate them into white culture, so they made their own. It was good for a while, then desegregation happened and during the culture shock their culture partially collapsed and hasent recovered. Government programs and social movements since haveonly made things worse.

>The Detroit Police Department's Crime Analysis Unit has reported that crimes have dropped by 24 percent since the introduction of casino gaming to the city.[10] The number of homicides peaked in 1974 at 714 and again in 1991 with 615. By the end of 2010, the homicide count fell to 308 for the year with an estimated population of just over 900,000, the lowest count and rate since 1967.[11][12] By 2012, however, the murder count had rebounded to 411, with 386 considered criminal homicides.[13] According to a 2007 analysis, Detroit officials noted that about 65 to 70 percent of homicides in the city were confined to a narcotics catalyst.[14] In 2013, Detroit's number of criminal homicides was 333, a reduction of 14% compared to 2012. However, taken in context by population, Detroit remains as a city with one of the highest rates per capita for homicide in the United States.[15]

>>3312883
There are a few main factors as to why so many blacks live in the inner city, and why crime there is so high:
First, black GIs weren't eligible for aid from the GI Bill, which helped give hundreds of thousands of (white) GIs a massive leg up in life. This meant that blacks had far fewer opportunities for college education, affordable home loans, etc.

In the following decades, there was a phenomenon known as 'white flight'. Basically, all the white families moved out from the cities to the suburbs. As a result, there was a general outflow of wealth, meaning that there was less tax money to be used to maintain roads, provide public services, fund schools, etc. This was coupled with real estate practices known as blockbusting and redlining.

In the former, a real estate agent would go into a mostly-white neighborhood with new black residents, and point out that black families moving in would tank the home's property value in the coming years. They'd then offer to buy the house up front; not market value, but more than what they say it would be worth later on. They'd then sell the houses at market price to black families, causing more fear about property values plummeting and continuing the cycle.

The latter was where real estate agents would refuse to offer homeowners' loans to certain areas (read: all-black neighborhoods), which they would outline in red on city maps. This led many blacks to have to rent houses rather than buy, meaning that they had far less financial equity than the average (house-owning) white family.

Then, you factor in the decline of American industry. Most of the cities with high inner-city black populations were also massive industrial centers (Chicago, Detroit, Gary, etc.), so plants shutting down led to most blue-collar jobs drying up. The rise of the drug trade and the crack epidemic meant that crime was far more lucrative (and often, the only viable option) compared to a legal job.