This will give you peace of mind, in that you can verify whether or not a professor has submitted a letter. It also gives you a polite way to ask a follow-up: I see that you haven't checked off the spreadsheet for X and it's due in three days.
Of the nearly 200 countries out there, the Brits have invaded all but 22. That is just about 90% of all countries! Mongolia, the Ivory Coast, Bolivia and Sweden are among the selective group of making it to 2013 without a British invasion. Here is the map showing where (pink) the British have invaded.
Isolated by the English Channel and protected by the much vaunted Royal Navy, Britain, as always, had the chance to decide whether or not to participate in the struggle. After the German invasion of Belgium, Britain decided to come to the aid of Belgium and France and subsequently declared war on Germany.