What does this shows:

Although Germany was excluded from negotiations, they had to sign the agreement. On the other hand, the United States did not sign the treaty. Instead, it formed a separate treaty with Germany.

CAN YOU ANSWER IT FAST PLEASE
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It shows since other countries excluded Germany from negotiations, United States decided not to exclude Germany making negotiations with them and  to form a treaty with Germany. I hope this helps :)

Explanation:

answer; beware of exaggerated claims without supporting evidence;