Which nation saw a decline in trade with the United States during WWI ?

The most possible answer would probably be Germany, "the American dollar plummeted from 32.9 to 1 in 1919 to 433 billion to 1 by 1924. The paper on which German marks were printed had more value as kindling or children's building blocks than as currency." From History.com (This is the most likely answer for your question,)

the punishment for breaking the law would depend on the conditions or the seriousness of the law being broken, if he or she breaks the law while doing some great discovery or invention then it would classify as a scientific fraud. there are other words to describe the crime but scientific fraud would be the harshest one.