Bangladesh became independent in 1971 not 1972. And it was not formerly part of India, but was part of Pakistan. Makes me wonder what else is wrong in that chart.
Actually, being off by one year isn't such a big deal. Most maps from the first half of 1971 would not show Bangladesh. But it lists Bangladesh as being previously of India before 1971. That is just wrong since it was part of Pakistan from 1947 to 1971.