From the 13th century A.D. the Buddhist and Hindus were swamped by the flood of muslim invaders and the tide of Islam upto 18th century. Sometimes there were independent rulers like the Hussain Shahi and IIyas Shahi dynastis while at other times they ruled on behalf of the imperial seat of Delhi.
From 15th century the Europeans, namely; Portuguese, Duch, French and British traders exerted an economic influence over the region. British political rule over the region began in 1757 A.D. when the last muslim ruler of Bengal was defeated at Palassey. In 1947 the country was partitioned into India and Pakistan. Present Bangladesh become the eastern wing of the then Pakistan. But the movement for autonomy for East Pakistan started within couple of years because of language and cultural difference and economic wings. The seeds of independence were sown through the Language Movement of 1952 to recognize Bangla as a state language. Ultimately the then East Pakistan emerged as a sovereign and independent state of Bangladesh in 1971 after nine month-long war of Liberation in which 3 million people courted martyrdom.