What does this shows:
“although there was no requirement compelling an American declaration of war, the US might be bound to impose an economic embargo or to sever diplomatic relations”.
ANSWER IT FAST PL
YOU WILL HAVE 20 POINTS

Embargo means banning the export or the imports, imposing taxes, seizing assets, bank accounts, reducing transport of high-tech products.

Explanation:

The Treaty Of Versailles was signed by the Paris, its an important peace treaty after the World War 1. This treaty also formed League of Nation. This treaty was made basically to punish the Germans and to help the Allied Powers to achieve their goal. This treaty was beneficial for United States Of America , France and Great Britain.

The Germans were blamed for the war because they were the first to declare the war as well as they influenced other countries to fight, their armed forces were also reduced.  After the war in the year 1919 on 19th November the US did not sign the treaty neither joined the league US had objections .

Although Treaty Of Versailles came to an end due to various reasons such as the Allies were not ready to agree the way Germany should be treated, Germany was not ready to accept the terms that they were given.

the answer to your question is,

old stone age.

-mabel < 3