What is the primary geographic factor that connects the region of latin america

The primary geographic factor that connects the region of Latin America is the "Isthmus of Panama".

Explanation:

Isthmus is a "strip of narrow land" which connects two larger areas of lands with each other. One such isthmus exists to connect Latin America (continent of South America) to the North American continent. It is called the Isthmus of Panama. It lies to the south of the North American continent and serves as the only land route between the North and the South American continent. It hosts the famous Panama canal which is known as one of the "busiest trade routes" in the world.

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