One of the most important political, economic, legal, and ethical questions in the United States today is immigrant deportation policy. Where did the policy come from? When and why was it introduced in the United States? Who was the target of removal law? How were deportation laws enforced? In Expelling the Poor, historian Hidetaka Hirota, visiting assistant professor of history at the City University of New York-City College, answers these questions in revealing the roots of immigration restriction in the United States.