A large majority of Americans fears the U.S. will become involved in a major war, according to a new survey.

About three-quarters of Americans, 76 percent, are worried the U.S. will become engaged in a major war over the course of the next four years, compared to just 23 percent who are not worried, according to a new NBC News/SurveyMonkey online poll.

In a February poll, 66 percent of Americans expressed concern of becoming engaged in a major war.

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Forty-one percent of Americans think North Korea poses the greatest immediate threat to the U.S.

Just 28 percent think the Islamic State in Iraq and Syria (ISIS) poses the greatest immediate threat to the U.S., and 18 percent think it's Russia.

Fifty-nine percent of Americans now feel less safe from North Korea than one year ago. About one-quarter, 28 percent, say they feel about as safe from the North Korea threat as they felt in the summer of 2016.

Fifty-nine percent of Americans think the U.S. should mostly use diplomacy in dealing with North Korea, but 35 percent think the U.S. should use military action. Most Republicans, however, think the U.S. should mostly use military action with North Korea, compared with about three-quarters of Democrats who support using diplomacy to deal with the threat.

The poll was conducted from July 10 to 14 among 5,347 adults. Its margin of error is 2.1 percentage points.