Historically the border region has been a contested area located at the edge of the various Indian and Burmese empires. Britain had begun conquering India (including modern Bangladesh) in the 17th century, and gradually took control of most of the country, forming British India. From the 1820s-80s Britain also gradually conquered Burma; by the Treaty of Yandabo in 1826 which ended the First Anglo-Burmese War Burma recognised British control over Assam, Manipur, Rakhine (Arakan), and the Taninthayi coast, thereby delimiting much of the Indo-Burmese modern boundary in general terms. Large swathes of Burma were annexed following the Second Anglo-Burmese War of 1852–53. The remainder of Burma was conquered in 1885 and incorporated into British India. Further Indo-Burmese boundary modifications were made in 1894, 1896, 1901, 1921 and 1922.