Well-managed immigration can be a windfall for local economies by creating jobs and fueling growth, fostering innovation, and bringing in new revenue. But these benefits are neither automatic nor do they accrue evenly. Highly skilled and entrepreneurial migrants tend to flock to certain geographic "magnets" -- such as vibrant metropolises, financial hubs, or tech clusters -- while other regions may struggle to attract and retain native and foreign workers alike.Meanwhile increasing mobility has brought new challenges, which are also asymmetrically distributed. And many cities, even those experiencing new dynamism and growth, have to contend with community tensions arising over the allocation of often scarce public resources such as housing,...