the first world war dictatorships the Great Depression
german americans
In a word: France. Unfortunately, a simple "France" or "Germany" answer is not truly applicable. Countries as we know them today were really formed after the crusades. However, if one were to venture a guess as to which modern country suffered the most casualties during the crusades it would be France. They provided the most crusaders and settled the Holy Land the heaviest.
Chile and Saudi Arabia suffered the most.
Of the Allied Powers, Russia suffered the most military deaths, with 2,254,369 total. Of the Central Powers, the German Empire suffered the most military deaths, with 2,037,000 total.