The fast grow of the city gave a lot of problems. Before the year 1800 New York had already it's slums. Hundred thousands of ethnic descent from the poor south settled in New York. The main reason was that the system of social welfare was better than anywhere else in the country. To pay this social security the taxes in New York are very high. At this moment New York has great difficulties to keep on giving this expensive social security.

That is not the only problem, the busy streets which are filled with cars, trucks, and buses create a lot of pollution. The mass transit systems that are placed are helping, but the situation isn't improving much.