Which region is NOT a primary source of U.S. oil imports?

The correct answer is that Antarctica is not a primary source of U.S. oil imports because it does not have a developed oil production infrastructure, nor does it engage in oil exports. The Antarctic region is primarily protected by international treaties, such as the Antarctic Treaty System, which prioritizes scientific research and environmental protection over resource extraction. As a result, countries do not extract or import oil from Antarctica.

In contrast, the other regions listed—such as the Persian Gulf, Canada, and Mexico—have well-established oil industries that contribute significantly to the U.S. oil import market. The Persian Gulf is known for its vast and rich oil reserves. Canada is the largest supplier of crude oil to the United States, possessing extensive oil sands and various oil production capabilities. Mexico, with its own oil fields, also plays a major role in supplying crude oil to the U.S. market. Hence, it is clear why Antarctica stands out as not being a source of oil imports for the United States.