Along with the rapid growth went a differentiation almost as rapid and unique as the growth itself. In fact, both reacted on each other. The work was separated first into three main departments, viz.: Spiritual, Social and Trade. It will be necessary to make a brief statement of this differentiation in detail. In the Spiritual Department we have the extension of the original idea, that of converting the people. Corps, as the different religious groups were called, sprang up and multiplied until even the smaller towns were occupied. Converts were added by hundreds and thousands. Large numbers of the brightest and best of these converts were utilized in extending the work still further, and after undergoing a brief training, were sent out, some to aid the movement in the mother country, others to begin the work in different parts of Europe and in America, and still others as missionaries to all parts of the world. Meanwhile, the work in each local organization or Corps, became systematized, and the Corps were united into Sections or Divisions, the Divisions into larger districts called Provinces, and the Provinces into Commands, which for the most part controlled the territory of an entire country. Each of these divisions from the Corps to the Command, was delegated to an officer who had sole charge, and who was responsible to the officer above him. For example, the United States, at present, is divided into two Commands; the first extending from New York to Chicago; the second from Chicago to the Pacific Coast. The first Command has six Provinces; the second, four. Each Province has from three to nine Divisions, and each Division contains a number of Corps. Thus, while each Corps is complete in itself, the general administration is very highly centralized; so much so, that an order from General Booth at the National Headquarters, London, England, must be obeyed by every Corps in the world.