 Complete the following phrase:  Britain, with its naval, maritime, commercial and ficial domice, was committed to the European balance of power after 1815. Before 1850 Britain and France were the strongest powers in Europe, but by the 1850s they had become deeply concerned by the growing power of Russia, which had expanded westward towards Central Europe, and Prussia, which was increasingly assuming greater control and influence over the German lands, aside from Austria. The Crimean War of 185455 and the 