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Short answer: blood Longer answer: The flags of communist states all have red backgrounds, copied from the Soviet flag. This background honors the red flag of the Paris Communards of 1871. This in turn is based on the red flag used by the Jacobins during the French Revolution in the 1790s. Vietnam's pre-communist flag had a yellow background and either a red stripe or three red stripes. So red and yellow are traditional Vietnamese national colors.

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16y ago

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