February 21st day commemorates the lives sacrificed to make Bengali one of the national languages when Bangladesh was part of Pakistan. The West Pakistani regime tried to force Urdu as the national language, a fact that was strongly contested by Bengalis. On that fateful day a procession by Bengalis was shot at by police resulting in the death of 4 martyrs. The nascent Bengali nationalism ultimately gave birth to the free nation of Bangladesh.
On November 17, 1999 the UNESCO declared the 21st February as the International Mother Language Day.
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