The US did more business with the Allies than with Germany because they were closer to the Allies in politics and in language.
<span>America and Great Britain spoke English and had similar laws. They also had similar ancestry and Americans sympathized more with Britain and France. </span>
<span>Germany was also blocked off by a British blockade so trading with them would have been useless. Nothing would get through.
This is Hemingway's belief that issues should be dealt with stoically and heroically. This can be seen in The Old Man and the Sea in the way the man never gives up and fights the Fish with all that he's got.