A new poll revealed that an overwhelming majority of Americans think the war in Iraq was not worth it.

According to a NBC News/Wall Street Journal/Annenberg survey, 71 percent of Americans now say that the war in Iraq "wasn't worth it," NBC News reported.

The poll's results show a substantial difference in the number of Americans who thought the war was simply not worth fighting 18 months ago. A NBC/Wall Street Journal poll asking the same question back in January 2013 showed that 59 percent of Americans said the war wasn't worth it, compared to 35 percent who said the opposite.

Now, just 22 percent now believe the 2003 invasion into Iraq was worthwhile.

The polls also show that half of the people surveyed believe that the United States should be responsible to help the Iraqi government rebound and stabilize in midst of the civil unrest and sectarian violence.

Meanwhile, a NBC News/Wall Street Journal poll taken earlier this month shows that Americans are even more pessimistic about Iraq than the Afghanistan War. 27 percent of those surveyed said the Afghan conflict was worth it, while 65 percent disagreed.

Despite the fact that Iraq is on the brink of civil war, a poll released last week revealed that over half of Americans oppose U.S. intervention in the country.

While Iraq faces an advance from radical Sunni Islamists, a Reuters-IPSOS Poll released Thursday shows that 55 percent of respondents oppose intervention of any kind, The New York Times reported. Only 20 percent support U.S. involvement. The survey showed little disparity among responses from Democrats, independents and Republicans.

When questioned about whether they stand behind President Barack Obama's position not to intervene unless the Shiite-led Iraqi government begins power-sharing with Sunni and Kurdish leaders, most respondents said they still opposed U.S. engagement. Forty-five percent said the United States should not get involved in the conflict "no matter what," while 34 percent support Obama's conditions for engagement and 21 percent said the U.S. must get involved to stop radicals from seizing power.