The Herald-Sun, Sydney Morning Herald, The Courier Mail

Almost a decade after the September 11 terror attacks in the US, most Australians and Americans think the wars in Iraq and Afghanistan are not worth the cost.

A study conducted by the US Studies Centre at the University of Sydney has found a significant number believe the conflicts in Iraq and Afghanistan are not helping to win the war on terrorism.

The study involved online polling of the views of 2210 Australians and 900 Americans between May 2 and May 18.

The centre's chief executive, Professor Geoffrey Garrett, said responses gathered after the death of terrorism mastermind Osama bin Laden showed most Australians polled (63 per cent) think the war on terrorism will never end, with only 30 per cent of Americans and 20 per cent of Australians confident it is being won.

"Both Australians and Americans are clearly sick and tired after the 9/11 decade of war," he said in a statement.

"They doubt the prohibitive costs have been well spent and don't think the West is winning. People have moved on from the 9/11 decade to focus on their economic anxieties after the global financial crisis."

Only four per cent of Australian and three per cent of American respondents selected terrorism as the most important problem facing their respective countries.

In both cases, just one per cent nominated the war in Afghanistan as their greatest concern.

However Americans are more worried about a terrorist attack on home ground than Australians, who believe their country has moved on from the "9/11 decade" more readily than the US.

On both sides of the Pacific the 9/11 attacks on New York and Washington DC are regarded as more significant than the 1941 attack on Pearl Harbour and the atomic bombing of Hiroshima and Nagasaki.

The study found ALP and coalition supporters tended to strongly agree on matters to do with terrorism.

In the US, Democrats and Republicans were less likely to agree on terrorism, although they were closer on that topic than on other issues in American public opinion.

Asked to identify the most important problem facing Australia, respondents chose from immigration, environment, the Afghan war, terrorism, natural disasters and the economy.

Thirty per cent rated the economy as the number one concern, ahead of immigration.

On the same question, Americans weighed in at 38 per cent for the economy, 16 per cent for health care and 14 per cent for security.