The growth of a race of hybrid African blood has been one of the results of the substitution at an early date of imported negro slaves to supply the place of the rapidly disappearing Indians who perished under the exactions of their taskmasters. According to careful data set forth in the United States census for 1850, the whole number of native Africans imported cannot have exceeded 400,000. At present the coloured race—hybrids chiefly—of African blood numbers nearly 7,000,000. In 1715 there were 58,000 negroes in British America; in 1775, when the revolution broke out, there were 501,102. After the epoch of independence the increase became more rapid. In 1790 the numbers were 757,208; in 1800, 893,041; in 1810, 1,191,364. At the date of emancipation in 1865 there were, in round numbers, in slavery, 4,000,000; and at the census in 1880 the negro population in the United States had risen to 6,580,793;[149] and in the returns thus far published relative to the later census of 1890, in the Southern States alone they are reported to number 6,996,116; so that with the added numbers of the Northern States and Canada they can fall little short of 8,000,000. Of this numerous intrusive race, the larger number are hybrids; and, as was inevitable, they include some small proportion of mixed negro and Indian blood.[150] But it is the Metis, or White and Red half-breed, that constitutes the subject of special interest here. Various causes have tended to beget more friendly relations between the older colonists of New France, and at a later date between those of British America and the native Indian race, than have existed either in Spanish America or the United States. The great North-West, with its warlike Chippeways, Crees, Sioux, and Blackfeet; and beyond the Rocky Mountains its Tinné, Babeens, Clalams, Newatees, Chinooks, Cowlitz, and numerous other native tribes; had till recently been under the control of the all-powerful fur-trading company of Hudson Bay. The interests of the fur-traders stimulated them to fair and honourable dealing with the native tribes; and while they had no motive to encourage the Indians to abandon their nomadic life for the civilised habits of a settled people, or even to interpose in the wars which varied the monotony of the Indians’ wild hunter-life, they had so thoroughly won the confidence of the natives, that tribes at open enmity with each other were ready to repose equal confidence in the Hudson Bay factors.