Mauritania has the newest flag. In 2017, this African nation updated its flag to include two red stripes.
Understanding "Newest" in the Context of Flags
Determining the "newest" flag requires clarification. Does "newest" refer to the most recently adopted flag, or the most recently designed? This answer focuses on the most recently adopted flag, based on available information.
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Recently Adopted: The information provided clearly states that Mauritania updated its flag in 2017. While other countries may have subtly altered their flags since, Mauritania's change involved a significant addition, making its updated flag the most recent notable change.
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Design vs. Adoption: It's important to distinguish between the design of a flag and its official adoption. A new design may exist, but until officially adopted by a country, it remains unofficial.
Several sources support Mauritania's claim:
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Torrance Recycles: This source explicitly states, "The title of the newest flag in the world goes to Mauritania, a country..." https://torrancerecycles.org/_rcylst_dyk/the-oldest-and-newest-flags-of-the-world/
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Other Sources: While other sources mention recent flag adoptions (e.g., South Sudan), none contradict Mauritania's 2017 update as the most recent significant change.
