With industrial prosperity, political unity became assured. Canada became more and more a name of which all her sons were proud. Expansion brought men of the different provinces together. The Maritime Provinces first felt fully at one with the rest of Canada when Vancouver and Winnipeg rather than Boston and New York called their sons. Even Ontario and Quebec made some advance toward mutual understanding, though clerical leaders who sought safety for their Church in the isolation of its people, imperialists who drove a wedge between Canadians by emphasizing Anglo-Saxon racial ties, and politicians of the baser sort exploiting race prejudice for their own gain, opened rifts in a society already seamed by differences of language and creed. In the West unity was still harder to secure, for men of all countries and of none poured into a land still in the shaping. The divergent interests of the farming, free trade West and of the manufacturing, protectionist East made for friction. Fortunately strong ties held East and West together. Eastern Canadians or their sons filled most of the strategic posts in Government and business, in school and church and press in the West. Transcontinental railways, chartered banks with branches and interests in every province, political parties organizing their forces from coast to coast, played their part. Much had been accomplished; but much remained to be done. With this background of rapid industrial development and growing national unity, Canada's relations with the Empire, with her sister democracy across the border, and with foreign states, took on new importance and divided interest with the changes in her internal affairs. From being a state wherein the mother country exercised control and the colonies yielded obedience the Empire was rapidly being transformed into a free and equal partnership of independent commonwealths under one king. Out of the clash of rival theories and conflicting interests a new ideal and a new reality had developed. The policy of imperial cooperation--the policy whereby each great colony became independent of outside control but voluntarily acted in concert with the mother country and the sister states on matters of common concern--sought to reconcile liberty and unity, nationhood and empire, to unite what was most practicable in the aims of the advocates of independence and the advocates of imperial federation. The movement developed unevenly. At the outbreak of the Great War, it was still incomplete. The ideal was not always clearly or consciously held in the Empire itself and was wholly ignored or misunderstood in Europe and even in the United States. Yet in twenty years' space it had become dominant in practice and theory and had built up a new type of political organization, a virtual league of nations, fruitful for the future ordering of the world.