The Berkley Center for Religion, Peace & World Affairs at Georgetown University in Washington, D.C., is dedicated to the interdisciplinary study of religion, ethics, and public life.

The Council on Foreign Relations is an independent, nonpartisan membership organization, think tank and publisher dedicated to helping its members better understand the world and the foreign policy choices facing the United States and other countries.

The Population Studies Center at the University of Michigan is a leading resource for information about demographic trends in the United States. The center has access to dozens of scholars and experts. It has a page providing links to experts in specific fields.

The Zolberg Center on Global Migration is at the New School University in New York City.

The Immigration History Research Center is based at the University of Minnesota. It is an interdisciplinary research center that brings together a variety of scholars. Erika Lee is director.

FindLaw offers links to the abortion laws for every state.

The Immigration & Ethnicity Institute at Florida International University has studied issues of religion and immigration.

The Center for Religion and Civic Culture at the University of Southern California has a principal focus on the study of religion and immigration and its various manifestations. Richard Flory is executive director, and Megan Sweas is communications director.

The Center for Immigration Studies is a nonpartisan research organization in Washington, D.C. Many of its researchers have concluded that current high levels of immigration are harming the country. The organization says it’s not anti-immigrant, however; instead, it favors a policy of fewer immigrants but a “warmer welcome for those who are admitted.” Mark Krikorian is executive director.