During the greater part of this period we must remember that conquered Ireland herself was contributing to the colonization of America. Every successive act of spoliation drove Catholic Irishmen across the Atlantic as well as into Europe, and gave every Colony an infusion of Irish blood. Until the beginning of the eighteenth century this class of emigration was for the most part involuntary. Cromwell, for example, shipped off thousands of families indiscriminately to the West Indies and America for sale, as "servants" to the colonists. The only organized and voluntary expedition in which Irish Catholics took part was that to Maryland under Lord Baltimore. The distinction in course of time became immaterial. In the free American air English, Scotch, and Irish became one people, with a common political and social tradition. It is interesting, and for a proper understanding of the Irish question, indispensable, briefly to contrast the characteristics and progress of the American and Irish settlements, and in doing so to observe the profound effects of geographical position and political institutions on human character. I shall afterwards ask the reader to include in the comparison the later British Colonies formed in Canada and South Africa by conquest, and in Australia by peaceful settlement. Let us note, first, that both in America and Ireland the Colonies were bi-racial, with this all-important distinction, that in America the native race was coloured, savage, heathen, nomadic, incapable of fusion with the whites, and, in relation to the almost illimitable territory colonized, not numerous; while in Ireland the native race was white, civilized, Christian, numerous, and confined within the limits of a small island to which it was passionately attached by treasured national traditions, and whose soil it cultivated under an ancient and revered system of tribal tenure. The parallel, then, in this respect, is slight, and becomes insignificant, except in regard to the similarity of the mental attitude of the colonists towards Indians and Irish respectively. In natural humanity the colonists of Ireland and the colonists of America differed in no appreciable degree. They were the same men, with the same inherent virtues and defects, acting according to the pressure of environment. Danger, in proportionate degree, made both classes brutal and perfidious; but in America, though there were moments of sharp crisis, as in 1675 on the borders of Massachusetts, the degree was comparatively small, and through the defeat and extrusion of the Indians diminished steadily. In Ireland, because complete expulsion and extermination were impossible, the degree was originally great, and, long after it had actually disappeared, haunted the imagination and distorted the policy of the invading nation.