Travel.State.Gov
In general, in order to be eligible to apply for an immigrant visa, a foreign citizen must be sponsored by a U.S. citizen relative(s) or by a prospective employer. Unlike most other immigrant categories, Immediate Relatives are not subject to numerical limits under immigration law. Additionally the Diversity Visa Program provides a certain number of permanent resident visa annually. These visas are drawn from countries with low rates of immigration to the U.S. more