Most say cooperation with other countries is important in dealing with global threats, especially on the spread of infectious diseases.
Around seven-in-ten Americans or more have seen defending against terrorism as a top priority for the White House and Congress since early 2002.
Today, 68% say the U.S. is less respected by other countries than it was in the past.
The Sept. 11 attacks united Americans in a way that few other historical events have.
About eight-in-ten U.S. Muslims (82%) say they are either very (66%) or somewhat concerned (16%) about extremism committed in the name of Islam around the world.
People across Europe and in the U.S. and Canada have pervasive concerns about the threat of Islamic extremism in their countries.
Overall, 48% of Americans say there are some circumstances under which the use of torture is acceptable in U.S. anti-terrorism efforts.
Learn more about a variety of factors driving the anti-establishment sentiments that are spreading throughout much of Europe.
As the 15th anniversary of 9/11 approaches, partisan differences over the ability of terrorists to launch a major attack on the United States are now as wide as at any point dating back to 2002.
After a year of escalating terror attacks against Western targets, people across Europe are widely supportive of U.S.-led military action against the Islamic militant group known as ISIS.