British rule in Burma
Britain's gradual annexation of Burma throughout the 19th century, in addition to concomitant economic and political instability in Upper Burma (e.g., increased tax burdens from the Burmese crown, British rice production incentives, etc.) also accelerated the migration of Burmese speakers from Upper Burma into Lower Burma. British rule in Burma eroded the strategic and economic importance of the Burmese language; Burmese was effectively subordinated to the English language in the colonial educational system, especially in higher education.