Bankruptcy of a city(Unconstitutional)

If the Federal government can allow a city like detroit to file bankruptcy without investigating how the monies they distributed to the State of Michigan were distributed to the Detroit urban area and was not used to improve the neighborhoods and communities.You would think there would be an federal investigation to find out what went wrong with the checks and balances of monies spend!When a state government refuse to send monies owed to the city then its something wrong with the constitution of the UNited States of America!They will bail out banks, but not a city!