WASHINGTON — Three in four Americans think history will judge the wars in Iraq and Afghanistan as failures, according to an Associated Press-GfK poll that shows about the same percentage think it was right to pull forces from the two countries.

Americans surveyed in last month’s poll were not optimistic about the chance a stable democratic government will be established in either country. Seventy-eight percent said it was either not too likely or not at all likely in Afghanistan and 80 percent said the same about Iraq.

Roughly three out of four Americans polled think in hindsight, each war will be deemed as an outright “complete failure” or “more of a failure than success.”

A majority of those polled, or 70 percent, said the United States was right to withdraw American troops from Iraq in 2011 and pull most U.S. forces out of Afghanistan by December. The two conflicts have consumed the nation for more than a decade and claimed the lives of 6,800 U.S. troops.

Nelson Philip, 73, of Oswego, Ill., is of two minds. He judges the Afghan war a failure, but wants U.S. troops to stay in countries that remain in turmoil.

“What’s so successful about it? We didn’t do anything there. The Taliban. They’re still there. We haven’t done anything and now we’re pulling everybody out of there,” Philip said. “And now this Islamic group is over there taking over Iraq.”

The situations in Afghanistan and Iraq are distinct. But in each, the U.S. has spent more than a decade trying to set up democratic governments that could effectively police their own territories and stamp out threats to the American homeland. And in both countries that objective is in peril — their futures threatened by a combination of poor leadership, weak institutions, interethnic rivalry, insurgencies and extremist rebellions.

Americans surveyed in the poll think more bad news is on the horizon.

Fifty percent — up 18 points in the past seven months — think the situation in Afghanistan will get worse. Fifty-eight percent — up from 16 percent in 2009 — expect conditions in Iraq will worsen. The poll was conducted shortly after Sunni extremists conducted an offensive that shattered security in Iraq.

The rapid advance by the extremist Islamic State group, which captured Iraq’s second-largest city, Mosul, and overran much of northern and western Iraq, has plunged the country into its worst crisis since the withdrawal of U.S. troops at the end of 2011.

Melody Fisher, a 58-year-old midwife from Prescott, Ariz., was among the roughly 25 percent who didn’t think it was time yet for American troops to return from Afghanistan, where about 2,340 U.S. servicemen and women have been killed. She said she wasn’t convinced the U.S. had finished its work there.

“I used to work with refuges so I’m very aware of the conditions that people have to live in,” said Fisher, who spent time helping resettle Cambodian refugees.

People over 50 expressed far more pessimism about the ultimate outcome of the two conflicts than their younger counterparts.

Sixty-two percent of those over 50 said the situation in Afghanistan would get worse in the coming year, compared with 40 percent of younger Americans.