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Many ignorant people will say "Because of black people". However the cause is much more deeper then a simple demographic.
Detroit from 1910 to 1950 was synonymous with automobile and their economy was thriving off of it. However, these industries in an attempt to avoid paying higher taxes and wages begin to outsource jobs to other countries or areas outside of Detroit for a much cheaper price. This caused the job opportunities in Detroit to decline. With the decline of job opportunities along with rising racial tension and race riots between blacks and whites, the affluent members of the city begin to flee to the newly devlop suburbs.
With the affluent members of the inner city gone this left the uneducated, poverty stricken citizens stuck in the city by themselves. With no job opportunities on the horizon, there were no chances of advancing up the social later. With no other perceivable option left, these poor people begin to resort to crime and reliance on gangs and drugs.
Corrupt politicians would then give the non-affluent citizens false hopes of increasing their financial state in an attempt to get elected into office. Once in office these politicians didn't do shit. Matter of fact they exasperated the problem by hemorrhaging money from the city in an attempt to fill up their own pockets. With little help from the State and the Federal Government, Detroit began to plummet to its now current state.
So corruption, outsourcing of jobs, racism, white flight, black flight, no aid from state/government and the fleeing of businesses elsewhere are all the factors that caused Detroit's current problem.0