| http://www.w3.org/ns/prov#value | - e United States and Mexico is the busiest in the world, with 350 million people crossing it every year.Figures on border activity have always been problematic because they only take into account apprehensions and people caught more than once trying to sneak in, not those who do make it across into the US, or the effect of factors such as like tunnels.Three years ago the Department of Homeland Secu
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