More than half of foreign-born citizens in the U.S. legally became naturalized citizens as of 2011, the highest level in three decades.

Just over half of Americans said protecting the environment should be a top priority for the president and Congress in 2013.

While perceived conflicts among other groups have declined, about eight-in-ten Americans see “very strong” or “strong” conflicts between Republicans and Democrats.

About seven-in-ten of those who used a library over a 12 month period did so to borrow print books or to browse the shelves.

Jeffrey Passel, a senior demographer for the Pew Research Center, describes how the number of unauthorized immigrants in the U.S. was calculated and what impact new immigration proposals may have on this group.

Roughly half of adults say they have ever tried marijuana, the highest percentage ever.

Asian-Americans exceed all U.S. adults when it comes to median household income, $66,000 vs. $49,800.

Nearly six-in-ten Americans said in a 2011 survey that what bothers them about the tax system is not their own bill, but a belief the wealthy don’t pay a fair share.

Roughly four-in-ten Americans who believe there is solid evidence of global warming say the cause is human activity, not natural weather patterns.

Americans are divided over whether mass shootings reflect broader societal problems or not – 47% say they do, 44% say they are isolated acts.