Wage war

ILLEGAL immigration from Mexico is not quite a century old. A law of 1917 was the first to regulate the southern border. Stricter controls gradually followed all through the 20th century, often during the low points of a recurring cycle of sentiment towards immigrants. Economic booms have lured workers across the Rio Grande, encouraged by American firms. Downturns have led to demonisation of “wetbacks”. The 1930s and 1950s both saw indiscriminate mass-deportations; in 1976 President Gerald Ford wondered how best to “get rid of those six to eight million aliens who are interfering with our economic prosperity”.