While 76 per cent correctly said Great Britain, 19 per cent were unsure, and 5 per cent mentioned another country.
It was young people letting the side down with 67 per cent of those under 30 giving the right country.
This is against 80 per cent of those 60 and older, 77 per cent of those 45 to 59, and 77 per cent of those between 30 and 44.
The same poll also showed that only 58 per cent of Americans know that the declaration came in 1776.
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