The description of prevailing winds and air currents you're referring to can be linked to the Earth's atmospheric circulation patterns, which are influenced by the Coriolis effect.
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Between 0° and 30° South Latitude: This region is characterized by trade winds that blow from east to west (the Southeast Trade Winds), particularly in the tropics.
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Between 30° North and 60° North Latitude: This region is influenced by the westerlies, where winds generally move from west to east.
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Between 60° South and 90° South Latitude: This area is typically dominated by polar easterlies.
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Between 30° South and 60° South Latitude: This region, known as the Roaring Forties, is also influenced by the westerlies, where winds predominantly blow from west to east toward the poles.
Given your original statement, the country located between 30° North and 60° North latitude or between 30° South and 60° South latitude is likely influenced by the prevailing westerlies, where winds travel from west to east. Countries between these latitudes include parts of North America, Europe, and Asia in the Northern Hemisphere, and parts of South America, Africa, Australia, and New Zealand in the Southern Hemisphere.