What are the causes, hazards and solutions to the decline of inner cities in the United States?

The decline of the old city is mainly due to the invention of the automobile. With cars, people can move to the suburbs farther away from the city and get a good living environment, so that almost all the people who stay in the city are poor. Naturally, they have no money to buy a house. Without financial support, people are prone to crime. Like those big cities in the United States, downtown areas can be said to be dilapidated, and robbery and drug trafficking are common. The government doesn't want to take care of these places, so the infrastructure is aging. Moreover, the inner city is generally a place to "accept" illegal immigrants. There are also some places in China, such as the center of Shanghai, which are dilapidated, and the vicinity of Shanghai Railway Station is even more serious, which is generally a place where homeless people gather. But on the whole, the suburbs of China have not developed well, so the city center has not reached that point.

If the decline of the inner city is a good thing, please take a walk in Chinatown in major cities. Chinatown is called drug street here ... right in the center of the city. Or go to HALEM, new york, and let Blackie grab your things with a gun.