A poll of nearly 2,000 Britons by YouGov/PHI found that 70 per cent of respondents incorrectly said it was true that the US had done a worse job than the European Union in reducing carbon emissions since 2000. More than 50 per cent presumed that polygamy was legal in the US, when it is illegal in all 50 states.

The poll was commissioned by America In The World , an independent pressure group that launches on Monday and aims to improve understanding and appreciation of the US in Britain and around the world.

Tim Montgomerie, its director, said factual inaccuracies and mistaken assumptions have contributed to Britons and Europeans taking a hostile stance towards their most powerful ally, which often acted against national interests.

"We wanted to find out how British people understood America and found that there was an unbalanced view. Maybe there are good reasons but if we cleared a lot of that factual ignorance we would have a better understanding of what America really is," said Mr Montgomerie, who also founded the influential ConservativeHome website three years ago.

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