Final answer:
The basic independent unit of world politics is the state, synonymous with a country, that holds sovereignty within its territorial boundaries.
Explanation:
The basic independent unit of world politics is a state, which is synonymous with a country. A state represents a formal region where the government has sovereignty over its own affairs within its territorial boundaries. Nation-states encompass people with shared ethnicity, while multinational states have more than one nation within their borders.
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