Why did the percentage of immigrants living in Los Angeles decrease from 1980 to 2000, while numbers across the United States rose dramatically?
"CONVENTIONAL wisdom holds that cities and metropolitan areas are powerless to deter immigrants from moving in. Evidence suggests otherwise. Between 1980 and 2000, the Los Angeles metropolitan area deflected nearly 1 million Mexican immigrants, legal and illegal, to other U.S. cities.
During that 20-year interval, the immigrant population in the United States increased from 14 million to 31 million, but the percentage of those immigrants living in the city of Los Angeles declined from 6.8% to 4.9%, according to U.S. census data."
"Why did a million Mexican immigrants bypass the L.A. region and settle elsewhere? Three factors were important: migration networks, market economics and tougher local regulation of slums and sweatshops."
FULL STORY: How L.A. kept out a million migrants

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This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
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Learn the tools for implementing Universal Design in planning regulations.
New York City School Construction Authority
Village of Glen Ellyn
Central Transportation Planning Staff/Boston Region MPO
Institute for Housing and Urban Development Studies (IHS)
City of Grandview
Harvard GSD Executive Education
Regional Transportation Commission of Southern Nevada
Toledo-Lucas County Plan Commissions