To obey the Pope's call to free the Holy city from the infidels and ensure access for pilgrims. To be forgiven for past sins. The Pope offered forgiveness for anyone who took part. This was important for knights who had killed many people in battle. To see the world, have an adventure and prove their bravery.
Many economists felt that the reparations demanded from Germany were excessive and counterproductive. Operating from the principle of permanently weakening Germany, France was particularly keen on punishing Germany and limiting its ability to wage war. This approach, however, backfired because reparations were so severe Germany plunged into economic chaos. This situation allowed for the rise of Adolf Hitler and planted the seeds for WWII.
The british army was becoming increasingly nervous about the american abilities.
