As the United Nations tightens economic sanctions on North Korea, a 1990 Gallup poll reminds us that Americans have some important history with sanctions.

Fifty years ago, in March 1966, 47% of Americans described themselves as hawks on the Vietnam War -- wanting to step up the fighting -- while 26% described themselves as doves, wanting to slow it down.

by Frank Newport and Julie Ray

While observers are lauding the nuclear agreement reached among international powers Tuesday as a way to reshape relations between Iran and the West, Gallup surveys show distrust on both sides.