Read the following materials and answer the questions. Data 1: The development of American cities began with 1609 European immigrants. Due to geographical factors and natural advantages, early.

(2) The number of cities increases, the scale of land use expands, the urban population increases, and the proportion of urban population increases.

(3) urban areas: the proportion of population and jobs is gradually decreasing, thus alleviating urban environmental problems; Suburbs: proportion of population and proportion of jobs

Gradually rise, and finally surpass the urban area, and develop beyond the urban area.