What does it mean to be a citizen of the United States? The Carnegie Foundation has sponsored this report from the Migration Policy Institute to provide some perspective on the economic value of citizenship for immigrants in the United States. The report was authored by Madeleine Sumption and Sarah Flamm, and it offers a comprehensive look on this subject. The 19-page report includes an executive summary, and chapters such as "Who Naturalizes, and Why?" and "What is the Economic Value of Naturalization?" The report notes that naturalization appears to confer economic gains that include a wage premium of at least 5 percent. It's also interesting to note that naturalization rates in the United States are lower than most other Organization for Economic Cooperation and Development (OECD) countries.