When and why did the US military change from barbed wire to concertina razor wire? Was it an American invention? - Quora
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Texas Governor Gregg Abbott Sent Miles of Razor Wire to Help Mexico Stop Immigrants from Reaching the U.S. - Left Voice
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VEVOR Razor Wire 246 ft. Galvanized Barbed Wire Razor Ribbon Barbed Wire 5 Coils 49 ft. Per Roll Garden Fence 5PCS15MJSSW000001V0 - The Home Depot
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Barbed wire, and other terms for how the US is fortifying the Mexican border - Columbia Journalism Review
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