Historically in the United Statesthe white middle class gradually left the cities for suburban areas because of higher crime rates and perceived danger caused by African-American migration north toward cities after World War I the Great Migration —the so-called " white flight " phenomenon. More townspeople with urban skills moved during the second migration. More than 80 percent lived in cities. A majority of 53 percent remained in the South, while 40 percent lived in the North and 7 percent in the West.
Americans began demanding more and improved roads to capitalize on the mobility made possible by the car. Also, the automotive, construction, and Urban decline related industries lobbied state and federal governments to become heavily involved in funding road construction, a responsibility previously relegated to local governments.
As cars became affordable for the average American, and paved roads became increasingly ubiquitous, not only did the suburban frontier open up to a rising proportion of the population; it was now possible to live almost anywhere in the United States.
Another factor that opened up the rest of the United States for urban development was a change in the cost of obtaining energy. Obtaining abundant, cheap energy is a concern for firm owners and for households. Historical constraints on production and residential locations continued to fall away in the late nineteenth and early twentieth century as innovations in energy production began to take hold.
Energy could be generated at any site Urban decline could travel long distances through thin copper wires. Over a fifty-year period from tothe proportion of goods manufactured using electrical power soared from 0.
With the complementary advancements in transportation, factories now had the option of locating outside of the city where they could capture savings from cheaper land. The flexibility of electrical power also offered factories new freedom in the spatial organization of production.
Whereas steam engines had required a vertical system of organization in multi-level buildings, the AC grid made possible a form of production that permanently transformed the face of manufacturing — the assembly line Nye The Great Migration Technological advances were not bound by urban limits; they also extended into rural America where they had sweeping social and economic repercussions.
Historically, the vast majority of African Americans had worked on Southern farms, first as slaves and then as sharecroppers. But progress in the mechanization of farming — particularly the development of the tractor and the mechanical cotton-picker — reduced the need for unskilled labor on farms.
The dwindling need for farm laborers coupled with continuing racial repression in the South led hundreds of thousands of southern African Americans to migrate North in search of new opportunities.
The overall result was a dramatic shift in the spatial distribution of African Americans. Inmore than three-fourths of black Americans lived in rural areas, and all but a handful of rural blacks lived in the South. Blacks had begun moving to Northern cities in large numbers at the onset of World War I, drawn by the lure of booming wartime industries.
In the s, Southern blacks began pouring into the industrial centers at more than triple the rate of the previous decade, bringing with them a legacy of poverty, poor education, and repression.
The swell of impoverished and uneducated African Americans rarely received a friendly reception in Northern communities. Instead they frequently faced more of the treatment they had sought to escape Groh Furthermore, the abundance of unskilled manufacturing jobs that had greeted the first waves of migrants had begun to dwindle.
Manufacturing firms in the upper Midwest the Rustbelt faced increased competition from foreign firms, and many of the American firms that remained in business relocated to the suburbs or the Sunbelt to take advantage of cheap land.
As inner city African Americans coped with high unemployment rates, high crime rates and urban disturbances such as the race riots of the s were obvious symptoms of economic distress.
High crime rates and the race riots simply accelerated the demographic transformation of Northern cities. The American City in the Twenty-First Century Some believe that technology — specifically advances in information technology — will render the city obsolete in the twenty-first century.Across the region, Central Asian countries, as well as Poland and Turkey, appear to be less affected by city population decline, whereas countries like Bulgaria, Albania, and Romania are seeing more than 80% of their cities declining.
The rate at which cities are growing or declining also varies substantially within countries, with some presenting distinct spatial patterns.
The Population Division of the Department of Economic and Social Affairs of the United Nations has been issuing since revised estimates and projections of the urban and rural populations of all countries in the world and of their major urban agglomerations.
The deindustrialization of Detroit has been a major factor in the population decline of the city.. Role of the automobile industry.
Before the advent of the automobile, Detroit was a small, compact, regional manufacturing center. In , Detroit had a population of , people, making it the thirteenth largest city in the U.S.
Over the following decades, the growth of the automobile. Source: Urban Institute calculations from Survey of Financial Characteristics of Consumers (December 31), Survey of Changes in Family Finances , and Survey of Consumer Finances – Notes: dollars. No comparable data are available between and Explore the past, present, and future of the city of Detroit through it's landmarks and lesser-known abandoned buildings on plombier-nemours.com A page of resources to help students of AQA's World Cities unit at Advanced Level - urban Declione.