This active commerce between the West and South, however, soon caused a rivalry in the East, that pushed forward improvements, by States or Corporations, to gain a share in the Western trade. These improvements, as completed, gave to the West a choice of markets, so that its Farmers could elect whether to feed the slave who grows the cotton, or the operatives who are engaged in its manufacture. But this rivalry did more. The competition for Western products enhanced their price, and stimulated their more extended cultivation. This required an enlargement of the markets; and the extension of slavery became essential to Western prosperity. We have not reached the end of the alliance between the Western Farmer and Southern Planter. The emigration which has been filling Iowa and Minnesota, and is now rolling like a flood into Kansas and Nebraska, is but a repetition of what has occurred in the other Western States and Territories. Agricultural pursuits are highly remunerative, and tens of thousands of men of moderate means, or of no means, are cheered along to where none forbids them land to till. For the last few years, public improvements have called for vastly more than the usual share of labor, and augmented the consumption of provisions. The foreign demand added to this, has increased their price beyond what the planter can afford to pay. For many years free labor and slave labor maintained an even race in their Western progress. Of late the freemen have begun to lag behind, while slavery has advanced by several degrees of longitude. Free labor must be made to keep pace with it. There is an urgent necessity for this. The demand for cotton is increasing in a ratio greater than can be supplied by the American planters, unless by a corresponding increased production. This increasing demand must be met, or its cultivation will be facilitated elsewhere, and the monopoly of the planter in the European markets be interrupted. This can only be effected by concentrating the greatest possible number of slaves upon the cotton plantations. Hence they must be supplied with provisions.