This report describes for the first time the totality and evolution since the mid-1980s of the current-day immigration enforcement machinery. The report's key findings demonstrate that the nation has reached an historical turning point in meeting long-standing immigration enforcement challenges. The question is no longer whether the government is willing and able to enforce the nation's immigration laws, but how enforcement resources and mandates can best be mobilized to control illegal immigration and ensure the integrity of the nation's immigration laws and traditions.