The American Dream is losing some of its most devoted fans: Mexicans. If Americans are now loath to go south of the border in case they contract swine flu, Mexicans increasingly don’t want to go in the other direction for fear of catching unemployment. New figures showed last week that the number of Mexicans coming to the States has fallen by a quarter – a whopping 226,000 people – in a year. Some Americans won’t be sorry, as more than half of Mexican immigrants are working here illegally. But the people who rely on them in their farms, kitchens and childcare equations will be horrified.