For millions of Americans, issues of racial and ethnic identification are frequently complicated, a legacy of the country’s endless waves of immigration as well as its long history of slavery and expansion into Native American lands across the continent.

The Pew Charitable Trusts
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How we communicate has changed rapidly over the last few years, and some of the greatest changes in behavior have been seen among teenagers, who are often “early adopters” of technologies. New applications and gadgets, though, can now quickly become commonplace and mainstream.

From the Scholars Strategy Network, written by Philip J. Cook and Kimberly D. Krawiec, Duke University

Interest groups are a feature of American politics, but studies of their actual effect on issues has been relatively scarce. A 2008 study by the International Monetary Fund, “Do Interest Groups Affect U.S. Immigration Policy?” seeks to quantify if and how different groups influence policy.

Relations between the governments of the United States and Iran have been tense, often hostile, since the Iranian Revolution in 1979. After Iran began to develop a uranium enrichment program, however, tension has again risen acutely, and increasingly strict economic sanctions have been put in place — particularly on Iran’s crucial energy sector — by the U.S. and some of its Western and East Asian allies.