Immigration from Mexico to the United States slowed at least 40 percent between
mid-decade and 2008, according to the analysis, based on national population
surveys
The US government is erecting a fence in the ocean to divide California from Tijuana, Mexico. Immigration and environmental activists say it is a costly, dangerous endeavour that will do little to keep out unauthorised migrants.
Concerns over immigration and security have prompted the US government to erect more than 1,000km of fencing along the Mexican border.
But the contentious plan which cuts through private property in some areas has sparked anger among some US homeowners and farmers.
Al Jazeera's Nick Spicer reports from Brownsville, Texas, along the Mexican border.
SAN FRANCISCO - In the debate over illegal
immigration
,
San Francisco has proudly played the role of liberal enclave, a so-called
sanctuary city where local officials have refused to cooperate with enforcement
of federal immigration law and undocumented residents have mostly lived without
fear of consequence.