The Islander Eastern Settlement Act is a law passed in Long Island.
Long Island can be roughly divided into two parts: the western 20% being home to three quarters of the total population, and the eastern 80% being sparsley populated. Under rule from Britain, immigrants were forced to live on 1/4 of the land, while the citizens could have the other 3/4 with a bloodline restriction. Things worked out pretty well, as citizens made the predominant group. However, when New England became independent immigrants made 45% of the population. The highly congested area brought diseases. The government had to find a solution.
Density in the west cooled from a high 68,900 to 23,700 persons per square mile over the first 15 years of effect.