Thus in 1820 there were twenty-two states in the Union, of which eleven were slave, and eleven free. Notice now two things: 1. That the dividing line between the slave and the free states was the south and west boundary of Pennsylvania from the Delaware to the Ohio, and the Ohio River; 2. That all the states in the Union except part of Louisiana lay east of the Mississippi River. As to what should be the character of our country west of that river, nothing had as yet been said, because as yet no state lying wholly in that region had asked admittance to the Union. %309. Shall there be Slave States West of the Mississippi River?%--But when the people rushed westward after the war, great numbers crossed the Mississippi and settled on the Missouri River, and as they were now very numerous they petitioned Congress in 1818 for leave to make the state of Missouri and to be admitted into the Union. The petitioners did not say whether they would make a slave or a free state; but as the Missourians owned slaves, everybody knew that Missouri would be a slave state. To this the free states were opposed. If the tobacco-growing, cotton-raising, and sugar-making states wanted slaves, that was their affair; but slavery must not be extended into states beyond the Mississippi, because it was wrong. No man, it was said, had any right to buy and sell a human being, even if he was black. The Southern people were equally determined that slavery should cross the Mississippi. We cannot, said they, abolish slavery; because if our slaves were set free, they would not work, and as they are very ignorant, they would take our property and perhaps our lives. Neither can we stop the increase of negro slave population. We must, then, have some place to send our surplus slaves, or the present slave states will become a black America. %310. The Missouri Compromise.%--Each side was so determined, and it was so clear that neither would yield, that a compromise was suggested. The country east of the Mississippi, it was said, is partly slave, partly free soil. Why not divide the country west of the great river in the same way? At first the North refused. But it so happened that just at this moment Maine, having secured the consent of Massachusetts, applied to Congress for admission into the Union as a free state. The South, which had control of the Senate, thereupon said to the North, which controlled the House of Representatives, If you will not admit Missouri as a slave state, we will not admit Maine as a free state. This forced the compromise, and after a bitter and angry discussion it was agreed 1. That Maine should come in as a free, and Missouri as a slave, state. 2. That the Louisiana Purchase should be cut in two by the parallel of 36° 30', and that all north of the line except Missouri should be free soil[1]. This parallel was thereafter known as the "Missouri Compromise Line."