International Mother Language Day commemorates a student protest in Dhaka, Bangladesh in 1952. The students were protesting the government's decision to make Urdu the sole national language of Pakistan, disregarding the Bengali language spoken by most in East Pakistan. When police killed student demonstrators on February 21st, 1952, it sparked widespread unrest. The movement campaigned for the right to use their mother language of Bengali. In 1956, Bengali became an official language of Pakistan. To honor the movement and victims, a memorial was constructed. In 2000, the UN declared February 21st International Mother Language Day.