Eight in 10 Americans said in 1999 that Columbine was not an isolated incident, but rather a sign that something was "seriously wrong" in the U.S.
President Donald Trump's recent executive order about the environment comes at a time when Americans have become more worried about the environment and less worried about energy.
Seven of the top 10 reasons Americans gave for the problem of teenage delinquency in 1954 had to do with bad parenting, especially lack of discipline.
Americans are mixed about how much the environment affects their consumer behavior. A solid majority have bought products that might help the environment, but fewer have contacted businesses or bought stocks for environmental reasons.
In the years bracketing World War II, many Americans were willing to curb free speech for groups perceived to be undermining the U.S. government.
Gallup tracked the evolution of Americans' acceptance of unconventional clothing choices by women, starting with slacks.
Public opinion changed in significant ways over the course of Barack Obama's presidency on issues such as the economy, trust in government and race relations.
Americans in 1942 were nearly unanimous in saying they would allow a son of theirs, even one as young as 14, to have a paper route.