... slaves; the true political population consisted of four and a half million free whites, or less one million able-bodied males, on whose shoulders fell the burden of a continent. Even after two centuries ... census of 1800, the USA contained 5,308,483 persons ,in the same year the British Islands contained upwards of fifteen million; the French Republic more than 27 million. Nearly one fifth of the American ... if you book the tickets ……………… advance. A. at B. in C. by D. for II. Identify the one underlined word or phrase that must be changed in order to make the sentence correct 1.My close friend , that...