As a US correspondent in the British Parliament I often give tours of the amazing Palace of Westminster to American visitors. When I take them around I always point out the fresco of the pilgrim fathers leaving for the new world, it is in pride of place close the lobby of the House of Lords.
It was painted in appropriately 1850, long before the US President was ever called ‘leader of the free world’. In fact it was painted when America was struggling to find its way in world. A few years earlier the British Army had burned down the White House, and our Empire seemed insurmountable.