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Intervening Obstacles
• Hinders migration• Historical- mountains deserts oceans• Modern Day- passports, visas
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U.S. Quota Laws• 1924:• 1965• 1978• 1990• Preferences
– Family reunificaton (chain migration)– Skilled workers– diversity
• Brain Drain
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Unauthorized immigration
• Characteristics of unauthorized immigrants– Source country– Children– Years in the United States– Labor Force– Distribution
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Undocumented Immigration to the United
States• Undocumented immigrants– ½ enter legally
(students, tourists) but remain after they are supposed to leave
– ½ illegally cross the border without passport or visa
– Become “documented” with forged documents
– The minority caught are deported
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• Americans divided on issue of immigration
• 1986 Immigration Reform and Control Act– Could become
permanent residents if they could prove continuous residence & apply for citizenship after 5 years
– Few applied– Discouraged
immigration• it made it harder for recent
immigrants to get jobs because of employer fines
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U.S. States as Immigrant Destinations
Fig. 3-8: California is the destination of about 25% of all U.S. immigrants; another 25% go to New York and New Jersey. Other important destinations include Florida, Texas, and Illinois.
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U.S. Immigrant Destinations
• ¼ California• ¼ New York, Florida,Texas• Coastal Cities• Similar distribution whether legal or
illegal• Mexico California, Texas, Illinois• Caribbean New York, Florida• Chinese, Indians California, New York• Other Asians California
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Undocumented Immigration:Mexico to Arizona
Fig. 3-7: The complex route of one group of undocumented migrants from a small village north of Mexico City to Phoenix, Arizona.
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United States/Mexico Border
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Characteristics of Migrants
• Gender- • Age and Education
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Immigration Concerns in the United States
• Border Patrols• Workplace• Civil Rights• Local Inititives• Label controversy
– Unauthorized immigrant, undocumented immigrant, illegal alien
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Immigration Concerns in Europe
• Sources• Opponents of Immigration• Europeans as Emigrants
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Undocumented Immigrants in the US
Fig. 3-7: California, Texas, and Florida are the leading destinations for undocumented immigrants to the U.S.
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U.S. - Mexico Border
at Tijuana
The U.S. side of the border is uninhabited and separated from Mexico by a fence
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U.S. States as Immigrant Destinations
Fig. 3-8: California is the destination of about 25% of all US immigrants; another 25% go to New York and New Jersey. Other important destinations include Florida, Texas, and Illinois.
What are the “US gateway” states? Story of a migrant http://www.pbs.org/pov/alotrolado/lesson_plan.php#activity
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Guest Workers
Migrants allowed into a country to fill a labor need, assuming the workers will go “home” once the labor need subsides
Have short term work visas Send remittances to home country
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Guest Workers
in Europe
Fig. 3-9: Guest workers emigrate mainly from Eastern Europe and North Africa to work in the wealthier countries of Western Europe.
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Global Remittances
http://www.economist.com/node/21553458/print
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Turkish Kebab Stand in Germany
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Gravity Model
• When applied to migration, larger places attract more migrants than do smaller places.
• Destinations that are more distant have weaker pull effect than do closer opportunities of similar caliber
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AP Human Geography
GRAVITY MODEL
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Gravity Model
• Uses size of location and distance as factors for travel
• Size of location takes precedent over distance• The gravity model can be used to estimate:• Traffic Flows • Migration between two areas • The number of people likely to use one central
place
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The GRAVITY MODEL of MIGRATION is a model, derived from Newton's law of gravity.
Newton's law states that: "Any two bodies
attract one another with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them.”
The GRAVITY MODEL of MIGRATION is used to predict the degree of interaction between two places
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When used geographically, the words 'bodies' and 'masses' are replaced by 'locations' and 'importance' respectively,.
Importance can be measured in terms of population numbers, gross domestic product, or other appropriate variable.
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The gravity model of migration is therefore based upon the idea that as the importance of one or both of the location increases, there will also be an increase in
movement between them.
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o The farther apart the two locations are, however, the movement between them will be less.
o This phenomenon is known as distance decay.
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The simplistic version of the gravity model of migration is as follows:
Mij = gravity model prediction of migration between origin i and destination jPi = population of origin State iPj = population of destination State jdij = distance from origin i to destination j
Mij
=
Pi*Pj
dij2
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CITY POPULATION (2012)ATLANTA 443,775
NEW YORK CITY 8,336,697
KNOXVILLE 182,200AUSTIN 842,592
LOS ANGELES 3,857,799CHICAGO 2,714,856
TULSA 393,987
COMPARE ATLANTA TO EACH OF THE CITIES LISTED
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Ullman’s Spatial Interaction Model
AP Geography
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Travel patterns for purchase of clothing and yard goods. A) Canadian rural cash-economy. B) Canadian older Mennonite sect.
Getis, Getis, Fellmann
Very different travel behaviors show the differences that may exist in the “action spaces” of different cultural groups occupying the same territory.
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Chicago Travel Patterns: shows 96% of all trips.
What factors influence & create these patterns of interaction?
Getis, Geits, Fellmann
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Edward Ullman’s Theory
• Spatial Interaction is controlled by three flow-determining factors.
1. Complementarity2. Transferability3. Intervening
Opportunity
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Complementarity• For two places to
interact, one place must have a supply of an item for which there is an effective demand.
• Example: product: Oil - Interaction: US - Middle East
• Differences of place is not enough to create interaction.
• Example: rain forest and Greenland
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What is Effective Demand?
• Desire for the item (demand)
• Purchasing Power - $$$
• Means to transport the product - rail, road, internet, ship etc.
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Transferability
• Refers to mobility of a commodity
• Spatial interaction occurs only when acceptable costs of an exchange are met.
• Costs include both Time and Money
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Transferability Function of Three Conditions.
• Characteristics and value of product.• The distance measured in time and
money.• The ability of the commodity to bear
the costs of movement.– Both physical and economic.– If the time and money costs are too
great interaction does not occur.– Buyer seeks substitute or goes without
product.
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Intervening Opportunity• Closer opportunities
will reduce the the attractiveness of interaction with more distant- even slightly better- alternatives.
• Example -ski area in Big Bear. The snow is not as good as Tahoe. But people in Southern Calif. are more likely to ski in Big Bear.
A
B
C
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Measuring Spatial Interactions
Key Concepts and Theories
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Friction of Distance
• Distance has a retarding effect on human interactions because there are increasing penalties in time and cost associated with longer distances.
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Space-Time Compression
• How do we measure relative distance - miles, time, cost?
• How is this different than absolute distance?
• What effects has information technology had on relative distance?
• Discuss - impacts on daily lives, cultural change, migration.
• Draw graphic to illustrate Space-Time Compression
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RefugeesPeople who flee across an international boundary because of a well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group, or political opinion
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Refugees: Sources & Destinations
Fig. 3-1: Major source and destination areas of both international and internal refugees.
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Hurricane Katrina Migrants
A major natural disaster represents an environmental push factor for forced migration.
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Scene from The Grapes of Wrath
The Dust Bowl in the 1930s led to forced migration from the Great Plains to California and elsewhere.
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• Subsaharan Africa• North Africa and Southwest Asia• South Asia• Southeast Asia• Europe
Regions of Dislocation
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How Do Governments Affect Migration?
• Immigration laws
• U.S. history– Little
restriction– Quotas by
nationality– Selective
immigration