Final answer:
The Isthmus of Panama joins an Occidental nation and acts as a land bridge between North and South America.
Explanation:
The Isthmus of Panama joined a nation from the Occidental continental zone. Central America serves as the final connection between North America and South America, with Panama acting as a land bridge between the continents. Historically, Panama was part of South America, controlled by colonial Colombia, and required ships to sail around the tip of South America to cross from the Atlantic to the Pacific Ocean.
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