Population density is a measurement of population per unit area or unit volume. It is applied to living organisms, most of the time to humans, it is a key geographical term. In simple terms population density refers to the number of people living in an area per kilometer square. Population density is population divided by total land water volume, as appropriate. Low densities may lead to further reduced fertility; this is called the Allee effect after the scientist. Examples of the causes in low population densities include: Increased problems with locating sexual mates Increased inbreeding For humans, population density is the number of people per unit of area quoted per square kilometer or square mile; this may be calculated for a county, country, another territory or the entire world. The world's population is around 7,500,000,000 and Earth's total area is 510,000,000 square kilometers. Therefore, the worldwide human population density is around 7,500,000,000 ÷ 510,000,000 = 14.7 per km2. If only the Earth's land area of 150,000,000 km2 is taken into account human population density is 50 per km2.
This includes all continental and island land area, including Antarctica. If Antarctica is excluded population density rises to over 55 people per km2. However, over half of the Earth's land mass consists of areas inhospitable to human habitation, such as deserts and high mountains, population tends to cluster around seaports and fresh-water sources. Thus, this number by itself does not give any helpful measurement of human population density. Several of the most densely populated territories in the world are city-states and dependencies; these territories have a small area and a high urbanization level, with an economically specialized city population drawing on rural resources outside the area, illustrating the difference between high population density and overpopulation The potential to maintain the agricultural aspects of deserts is limited as there is not enough precipitation to support a sustainable land. The population in these areas are low. Therefore, cities in the Middle East, such as Dubai, have been increasing in population and infrastructure growth at a fast pace.
Cities with high population densities are, by some, considered to be overpopulated, though this will depend on factors like quality of housing and infrastructure and access to resources. Most of the most densely populated cities are in Southeast Asia, though Cairo and Lagos in Africa fall into this category. City population and area are, however dependent on the definition of "urban area" used: densities are invariably higher for the central city area than when suburban settlements and the intervening rural areas are included, as in the areas of agglomeration or metropolitan area, the latter sometimes including neighboring cities. For instance, Milwaukee has a greater population density when just the inner city is measured, the surrounding suburbs excluded. In comparison, based on a world population of seven billion, the world's inhabitants, as a loose crowd taking up ten square feet per person, would occupy a space a little larger than Delaware's land area; the Gaza Strip has a population density of 5,046 pop/km.
Although arithmetic density is the most common way of measuring population density, several other methods have been developed to provide a more accurate measure of population density over a specific area. Arithmetic density: The total number of people / area of land Physiological density: The total population / area of arable land Agricultural density: The total rural population / area of arable land Residential density: The number of people living in an urban area / area of residential land Urban density: The number of people inhabiting an urban area / total area of urban land Ecological optimum: The density of population that can be supported by the natural resources Demography Human geography Idealized population Optimum population Population genetics Population health Population momentum Population pyramid Rural transport problem Small population size Distance sampling List of population concern organizations List of countries by population density List of cities by population density List of city districts by population density List of English districts by population density List of European cities proper by population density List of United States cities by population density List of islands by population density List of U.
S. states by population density List of Australian suburbs by population density Selected Current and Historic City, Ward & Neighborhood Density Duncan Smith / UCL Centre for Advanced Spatial Analysis. "World Population Density". Exploratory map shows data from the Global Human Settlement Layer produced by the European Commission JRC and the CIESIN Columbia University
Mitchell County Courthouse (Iowa)
The Mitchell County Courthouse in Osage, United States, was built in 2015. The former courthouse, built in stages between 1858 and 1926, was listed on the National Register of Historic Places in 1977 as a part of the County Courthouses in Iowa Thematic Resource; the courthouse is the second building the county has used for court functions and county administration. There was a dispute from 1855 to 1857 as to whether Mitchell or Osage should be the county seat of Mitchell County. A commission of delegates from other counties chose Osage and construction was begun on the courthouse; because another election was held to decide the issue construction was halted. Though a final decision would not be made until 1870 the courthouse construction proceeded and the main block was completed in 1858; the Italianate style building cost $25,000 to complete. The exterior was faced in brick and a silver domed cupola capped the structure. Two wings were added on either side of the main block in 1879 and 1882. A third wing was added to the rear of the building in 1926.
The exterior was restored from 1975 to 1976. By 2011 the courthouse was no longer receiving funds for maintenance from the Mitchell County Board of Supervisors. An ad hoc group rallied to preserve the building. County offices were moved to the Fox River Mills complex and Town & Country Plaza in late 2012. In the spring of 2013, the Mitchell County Board of Supervisors voted to replace the historic courthouse as structural issues had rendered the building unusable; the cost to rehabilitate the courthouse was nine million dollars. A proposed plan for a new courthouse including demolition of the existing structure is estimated at seven million dollars. On February 4, 2014, demolition of the courthouse began. A new $8.7 million courthouse was built on the location of the former courthouse, although it faces South Fifth Street and the former courthouse faced State Street. Its architectural style mimics the former courthouse from its brick exterior, to the portico in front, to the cupola on top, it was designed by the Sioux City architectural firm FEH Associates.
Henkel Construction of Mason City, Iowa was responsible for building the 30,000-square-foot structure. It was opened for business on August 20, 2015; the county's Veteran's Memorial is located on the west front of the courthouse. Media related to Former Mitchell County Courthouse at Wikimedia Commons
National Register of Historic Places
The National Register of Historic Places is the United States federal government's official list of districts, buildings and objects deemed worthy of preservation for their historical significance. A property listed in the National Register, or located within a National Register Historic District, may qualify for tax incentives derived from the total value of expenses incurred preserving the property; the passage of the National Historic Preservation Act in 1966 established the National Register and the process for adding properties to it. Of the more than one million properties on the National Register, 80,000 are listed individually; the remainder are contributing resources within historic districts. For most of its history the National Register has been administered by the National Park Service, an agency within the United States Department of the Interior, its goals are to help property owners and interest groups, such as the National Trust for Historic Preservation, coordinate and protect historic sites in the United States.
While National Register listings are symbolic, their recognition of significance provides some financial incentive to owners of listed properties. Protection of the property is not guaranteed. During the nomination process, the property is evaluated in terms of the four criteria for inclusion on the National Register of Historic Places; the application of those criteria has been the subject of criticism by academics of history and preservation, as well as the public and politicians. Historic sites outside the country proper, but associated with the United States are listed. Properties can be nominated in a variety of forms, including individual properties, historic districts, multiple property submissions; the Register categorizes general listings into one of five types of properties: district, structure, building, or object. National Register Historic Districts are defined geographical areas consisting of contributing and non-contributing properties; some properties are added automatically to the National Register when they become administered by the National Park Service.
These include National Historic Landmarks, National Historic Sites, National Historical Parks, National Military Parks, National Memorials, some National Monuments. On October 15, 1966, the Historic Preservation Act created the National Register of Historic Places and the corresponding State Historic Preservation Offices; the National Register consisted of the National Historic Landmarks designated before the Register's creation, as well as any other historic sites in the National Park system. Approval of the act, amended in 1980 and 1992, represented the first time the United States had a broad-based historic preservation policy; the 1966 act required those agencies to work in conjunction with the SHPO and an independent federal agency, the Advisory Council on Historic Preservation, to confront adverse effects of federal activities on historic preservation. To administer the newly created National Register of Historic Places, the National Park Service of the U. S. Department of the Interior, with director George B.
Hartzog Jr. established an administrative division named the Office of Archeology and Historic Preservation. Hartzog charged OAHP with creating the National Register program mandated by the 1966 law. Ernest Connally was the Office's first director. Within OAHP new divisions were created to deal with the National Register; the division administered several existing programs, including the Historic Sites Survey and the Historic American Buildings Survey, as well as the new National Register and Historic Preservation Fund. The first official Keeper of the Register was an architectural historian. During the Register's earliest years in the late 1960s and early 1970s, organization was lax and SHPOs were small and underfunded. However, funds were still being supplied for the Historic Preservation Fund to provide matching grants-in-aid to listed property owners, first for house museums and institutional buildings, but for commercial structures as well. A few years in 1979, the NPS history programs affiliated with both the U.
S. National Parks system and the National Register were categorized formally into two "Assistant Directorates." Established were the Assistant Directorate for Archeology and Historic Preservation and the Assistant Directorate for Park Historic Preservation. From 1978 until 1981, the main agency for the National Register was the Heritage Conservation and Recreation Service of the United States Department of the Interior. In February 1983, the two assistant directorates were merged to promote efficiency and recognize the interdependency of their programs. Jerry L. Rogers was selected to direct this newly merged associate directorate, he was described as a skilled administrator, sensitive to the need for the NPS to work with SHPOs, local governments. Although not described in detail in the 1966 act, SHPOs became integral to the process of listing properties on the National Register; the 1980 amendments of the 1966 law further defined the responsibilities of SHPOs concerning the National Register.
Several 1992 amendments of the NHPA added a category to the National Register, known as Traditional Cultural Properties: those properties associated with Native American or Hawaiian groups
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
Republican Party (United States)
The Republican Party referred to as the GOP, is one of the two major political parties in the United States. The GOP was founded in 1854 by opponents of the Kansas-Nebraska Act, which had expanded slavery into U. S. territories. The party subscribed to classical liberalism and took ideological stands that were anti-slavery and pro-economic reform. Abraham Lincoln was the first Republican president in the history of the United States; the Party was dominant over the Democrats during the Third Party System and Fourth Party System. In 1912, Theodore Roosevelt formed the Progressive Party after being rejected by the GOP and ran unsuccessfully as a third-party presidential candidate calling for social reforms. After the 1912 election, many Roosevelt supporters left the Party, the Party underwent an ideological shift to the right; the liberal Republican element in the GOP was overwhelmed by a conservative surge begun by Barry Goldwater in 1964 that continued during the Reagan Era in the 1980s. After the Civil Rights Act of 1964 and the Voting Rights Act of 1965, the party's core base shifted, with the Southern states becoming more reliably Republican in presidential politics and the Northeastern states becoming more reliably Democratic.
White voters identified with the Republican Party after the 1960s. Following the Supreme Court's 1973 decision in Roe v. Wade, the Republican Party made opposition to abortion a key plank of its national party platform and grew its support among evangelicals. By 2000, the Republican Party was aligned with Christian conservatism; the Party's core support since the 1990s comes chiefly from the South, the Great Plains, the Mountain States and rural areas in the North. The 21st century Republican Party ideology is American conservatism, which contrasts with the Democrats' liberal platform and progressive wing; the GOP supports lower taxes, free market capitalism, a strong national defense, gun rights and restrictions on labor unions. The GOP was committed to protectionism and tariffs from its founding until the 1930s when it was based in the industrial Northeast and Midwest, but has grown more supportive of free trade since 1952. In addition to advocating for conservative economic policies, the Republican Party is conservative.
Founded in the Northern states in 1854 by abolitionists, modernizers, ex-Whigs and ex-Free Soilers, the Republican Party became the principal opposition to the dominant Democratic Party and the popular Know Nothing Party. The party grew out of opposition to the Kansas–Nebraska Act, which repealed the Missouri Compromise and opened Kansas Territory and Nebraska Territory to slavery and future admission as slave states; the Northern Republicans saw the expansion of slavery as a great evil. The first public meeting of the general anti-Nebraska movement, at which the name Republican was suggested for a new anti-slavery party, was held on March 20, 1854 in a schoolhouse in Ripon, Wisconsin; the name was chosen to pay homage to Thomas Jefferson's Republican Party. The first official party convention was held on July 1854 in Jackson, Michigan. At the 1856 Republican National Convention, the party adopted a national platform emphasizing opposition to the expansion of slavery into U. S. territories. While Republican candidate John C.
Frémont lost the 1856 United States presidential election to James Buchanan, he did win 11 of the 16 northern states. The Republican Party first came to power in the elections of 1860 when it won control of both houses of Congress and its candidate, former congressman Abraham Lincoln, was elected President. In the election of 1864, it united with War Democrats to nominate Lincoln on the National Union Party ticket. Under Republican congressional leadership, the Thirteenth Amendment to the United States Constitution—which banned slavery in the United States—passed the Senate in 1864 and the House in 1865; the party's success created factionalism within the party in the 1870s. Those who felt that Reconstruction had been accomplished, was continued to promote the large-scale corruption tolerated by President Ulysses S. Grant, ran Horace Greeley for the presidency; the Stalwart faction defended Grant and the spoils system, whereas the Half-Breeds pushed for reform of the civil service. The Pendleton Civil Service Reform Act was passed in 1883.
The Republican Party supported hard money, high tariffs to promote economic growth, high wages and high profits, generous pensions for Union veterans, the annexation of Hawaii. The Republicans had strong support from pietistic Protestants, but they resisted demands for Prohibition; as the Northern postwar economy boomed with heavy and light industry, mines, fast-growing cities, prosperous agriculture, the Republicans took credit and promoted policies to sustain the fast growth. The GOP was dominant over the Democrats during the Third Party System. However, by 1890 the Republicans had agreed to the Sherman Antitrust Act and the Interstate Commerce Commission in response to complaints from owners of small businesses and farmers; the high McKinley Tariff of 1890 hurt the party and the Democrats swept to a landslide in the off-year elections defeating McKinley himself. The Democrats elected Grover Cleveland in 1884 and 1892; the election of William McKinley in 1896 was marked by a resurgence of Republican dominance that lasted until 1932.
McKinley promised that high tariffs would end the severe hardship caused by the Pa
1930 United States Census
The Fifteenth United States Census, conducted by the Census Bureau one month from April 1, 1930, determined the resident population of the United States to be 122,775,046, an increase of 13.7 percent over the 106,021,537 persons enumerated during the 1920 Census. The 1930 Census collected the following information: address name relationship to head of family home owned or rented if owned, value of home if rented, monthly rent whether owned a radio set whether on a farm sex race age marital status and, if married, age at first marriage school attendance literacy birthplace of person, their parents if foreign born: language spoken at home before coming to the U. S. year of immigration whether naturalized ability to speak English occupation and class of worker whether at work previous day veteran status if Indian: whether of full or mixed blood tribal affiliationFull documentation for the 1930 census, including census forms and enumerator instructions, is available from the Integrated Public Use Microdata Series.
The original census enumeration sheets were microfilmed by the Census Bureau in 1949. The microfilmed census is located on 2,667 rolls of microfilm, available from the National Archives and Records Administration. Several organizations host images of the microfilmed census online, digital indices. Microdata from the 1930 census are available through the Integrated Public Use Microdata Series. Aggregate data for small areas, together with electronic boundary files, can be downloaded from the National Historical Geographic Information System. 1930 Census Questions Hosted at CensusFinder.com 1931 U. S Census Report Contains 1930 Census results Historic US Census data 1930Census.com: 1930 United States Census for Genealogy & Family History Research 1930 Interactive US Census Find stories and more attached to names on the 1930 US census
Race and ethnicity in the United States Census
Race and ethnicity in the United States Census, defined by the federal Office of Management and Budget and the United States Census Bureau, are self-identification data items in which residents choose the race or races with which they most identify, indicate whether or not they are of Hispanic or Latino origin. The racial categories represent a social-political construct for the race or races that respondents consider themselves to be and, "generally reflect a social definition of race recognized in this country." OMB defines the concept of race as outlined for the US Census as not "scientific or anthropological" and takes into account "social and cultural characteristics as well as ancestry", using "appropriate scientific methodologies" that are not "primarily biological or genetic in reference." The race categories include both national-origin groups. Race and ethnicity are considered separate and distinct identities, with Hispanic or Latino origin asked as a separate question. Thus, in addition to their race or races, all respondents are categorized by membership in one of two ethnic categories, which are "Hispanic or Latino" and "Not Hispanic or Latino".
However, the practice of separating "race" and "ethnicity" as different categories has been criticized both by the American Anthropological Association and members of US Commission on Civil Rights. In 1997, OMB issued a Federal Register notice regarding revisions to the standards for the classification of federal data on race and ethnicity. OMB developed race and ethnic standards in order to provide "consistent data on race and ethnicity throughout the Federal Government; the development of the data standards stem in large measure from new responsibilities to enforce civil rights laws." Among the changes, OMB issued the instruction to "mark one or more races" after noting evidence of increasing numbers of interracial children and wanting to capture the diversity in a measurable way and having received requests by people who wanted to be able to acknowledge their or their children's full ancestry rather than identifying with only one group. Prior to this decision, the Census and other government data collections asked people to report only one race.
The OMB states, "many federal programs are put into effect based on the race data obtained from the decennial census. Race data are critical for the basic research behind many policy decisions. States require these data to meet legislative redistricting requirements; the data are needed to monitor compliance with the Voting Rights Act by local jurisdictions". "Data on ethnic groups are important for putting into effect a number of federal statutes. Data on Ethnic Groups are needed by local governments to run programs and meet legislative requirements." The 1790 United States Census was the first census in the history of the United States. The population of the United States was recorded as 3,929,214 as of Census Day, August 2, 1790, as mandated by Article I, Section 2 of the United States Constitution and applicable laws."The law required that every household be visited, that completed census schedules be posted in'two of the most public places within, there to remain for the inspection of all concerned...' and that'the aggregate amount of each description of persons' for every district be transmitted to the president."
This law along with U. S. marshals were responsible for governing the census. One third of the original census data has been lost or destroyed since documentation; the data was lost in 1790–1830 time period and included data from: Connecticut, Maryland, New Hampshire, New York, North Carolina, Rhode Island, South Carolina, Delaware, New Jersey, Virginia. Census data included the name of the head of the family and categorized inhabitants as follows: free white males at least 16 years of age, free white males under 16 years of age, free white females, all other free persons, slaves. Thomas Jefferson the Secretary of State, directed marshals to collect data from all thirteen states, from the Southwest Territory; the census was not conducted in Vermont until 1791, after that state's admission to the Union as the 14th state on March 4 of that year. There was some doubt surrounding the numbers, President George Washington and Thomas Jefferson maintained the population was undercounted; the potential reasons Washington and Jefferson may have thought this could be refusal to participate, poor public transportation and roads, spread out population, restraints of current technology.
No microdata from the 1790 population census is available, but aggregate data for small areas and their compatible cartographic boundary files, can be downloaded from the National Historical Geographic Information System. In 1800 and 1810, the age question regarding free white males was more detailed; the 1820