Fortunately, most posters here seem to understand that the concept of 'collective gratitude' of this or that nationality for something some other nation did in history should be taken with a grain of salt. I wish that most people would refrain from taking expressions such as 'we saved your asses' in such and such war, or 'you guys' did this or that to 'us' too seriously. How far back in history is one allowed to go with the concept of collective national responsibility? Should Americans still be 'grateful' to the French for helping us win our independence? How long is China allowed to hold a grudge against Japan for wartime atrocities or against Great Britain for the Opium War? Should Muslims and Jews still despise Catholics for the Crusades and for kicking them out of Spain, etcetera?