Final answer:
The United States made unilateral decisions related to the Panama Canal Zone due to historical and strategic factors.
Explanation:
The United States took unilateral decisions regarding activities in the Canal Zone due to various historical and strategic reasons. One key factor was the engineering of Panama's independence in 1903 to secure the construction and control of the Panama Canal. Additionally, strategic concerns and the desire to ensure stability in the region influenced U.S. actions in the area.
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