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Fifty years after Woodstock became the symbol of 1960s social upheaval, Gallup trends highlight how much has changed in U.S. society.
As AIDS spread in the 1980s, Gallup found some Americans expressing judgmental views about those who had contracted the disease.
Until recently, researchers have struggled with what should be a simple question: How many Americans are lesbian, gay, bisexual or transgender?
Over the next week, Gallup will release a series of three articles providing insight into LGBT issues.
In 1993, Americans had a mixed response to easing restrictions on gays serving in the military, and both sides felt strongly about their view.