What happened with nations foreign trade during the Great depression

The Great Depression had devastating effects in countries both rich and poor. Personal income, tax revenue, profits, and prices dropped, while international trade plunged by more than 50%. Unemployment in the U.S. rose to 25% and in some countries as high as 33%.

Easy cases are almost always resolved correctly by lower courts. If there doesn't appear to be a possibility of the lower court having made an error, the Supreme Court will decline to hear the case. Also, the Supreme Court has far too little time to hear every case sent to it, so it will tend to turn down cases that don't deal with important and difficult Constitutional issues.