What English do you Speak
English is the Germanic language we inherited from the Angles, a horde of invaders from Northern Germany. British English is spoken by about 1/3 of native English speakers and American English is spoken by the other 2/3.
It seems that British English will one day die out, being replaced by American English, as British influence continues to wane and American English continues to grow. Most authors today write in American English so as to reach a larger percentage of the population.