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The right question should be "Why are navigation aids reversed in US?"
The navigation lights and marks are prescribed across the world by the International Association of Lighthouse Authorities (IALA). In 1977 IALA endorsed two maritime buoyage systems putting an end to the 30 odd systems existing at that time.
Region A - IALA A covers all of Europe and most of the rest of the world, whereas region B - IALA B covers only the Americas, Japan, the Philippines and Korea. Fortunately, the differences between these two systems are few. The most striking difference is the direction of buoyage.
The reason for IALA B is that some Western and Asian countries did not accept the recommended uniform system IALA A.
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