What were the measures taken to decongest London during the 19th and 20th centuries?

Measures taken were:

A. New plans were created like underground railway was created so that people could settle in far off place.


B. Rent control was brought into account.


C. Unsafe tenaments were removed and single cottages were built outside the city.


Criminals were being watched and penalties were given to criminals for their acts. A green belt was built around the city which was called the "new lungs". Holiday homes were built in the countryside for residents of London.


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