Final answer:
Yes, there is a sentence fragment in the given text. The phrase 'Which gave the United States possession of the Panama Canal Zone' is a sentence fragment.
Step-by-step explanation:
Yes, there is a sentence fragment in the given text. A sentence fragment is an incomplete sentence that lacks either a subject or a predicate.
In the phrase 'Which gave the United States possession of the Panama Canal Zone', there is no subject before 'Which'. Therefore, it is a sentence fragment.