The dramatic decline was largely driven by Democrats, while most Republicans had strong feelings of national pride, according to the poll published Monday — an indicator of the deepening partisan divide in the US.

The findings are a stark illustration of how many — but not all — Americans have felt less of a sense of pride in their country over the past decade.

The percentage of Americans who say they are "proud to be an American" is down nine percent from last year, a recent study shows.