In recent years, more than 1 million people a year have immigrated to the U.S., a level not seen since before the Great Depression. This boom is most apparent in the urban areas where immigrants tend to cluster. Given their numbers, these newly arrived residents must have some effect on local...

In “Is Technology Raising Demand for Skills, or Are Skills Raising Demand for Technology?” Ethan Lewis describes a common view that recent technological advances, such as the introduction of computers, have rendered obsolete some occupations that require less skill and have increased...