Final answer:
The Gulf of Tonkin Resolution granted the executive branch, specifically the Johnson administration, significant power to escalate military operations in Vietnam without needing Congress to declare war.
Explanation:
The area of government that gained the most power under the Gulf of Tonkin Resolution was the executive branch, specifically the Johnson administration.
This resolution granted the President nearly unlimited power to escalate military operations in Vietnam without requiring a formal declaration of war by Congress.
It significantly expanded the executive branch's authority in conducting military actions abroad without explicit congressional approval.
Learn more about Government power under the Gulf of Tonkin Resolution here:
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