%307. The New States._--While the northern stream of population was thus traveling across New York, northern Ohio, Indiana, Illinois, and into Michigan, the middle stream was pushing down the Ohio. By 1820 it had greatly increased the population of southern Indiana and Illinois, and crossing the Mississippi was going up the Missouri River. In the South the destruction of the Indian power by Jackson in 1813, and the opening of the Indian land to settlement, led to a movement of the southern stream of population across Alabama to Mobile. Now, what were some of the results of this movement of population into the Mississippi valley? In the first place, it caused the formation and admission into the Union of six states in five years. They were Indiana, 1816; Mississippi, 1817; Illinois, 1818; Alabama, 1819; Maine, 1820; Missouri, 1821. %308. Slave and Free States.%--In the second place, it brought about a great struggle over slavery. You remember that when the thirteen colonies belonged to Great Britain slavery existed in all of them; that when they became independent states some began to abolish slavery; and that in time five became free states and eight remained slave states. Slavery was also gradually abolished in New York and New Jersey, so that of the original thirteen only six were now to be counted as slave states. You remember again that when the Continental Congress passed the Ordinance of 1787 for the government of the territory lying between the Ohio River and the Great Lakes, Pennsylvania and the Mississippi River, it ordained that in the Northwest Territory there should be no slavery. In consequence of this, Ohio, Indiana, and Illinois were admitted into the Union as free states, as Vermont had been. Kentucky was originally part of Virginia, and when it was admitted, came in as a slave state. Tennessee once belonged to North Carolina, and hence was also slave soil; and when it was given to the United States, the condition was imposed by North Carolina that it should remain so. Tennessee, therefore, entered the Union (in 1796) as a slave state. Much of what is now Alabama and Mississippi was once owned by Georgia, and when she ceded it in 1802, she did so with the express condition that it should remain slave soil; as a result of this, Alabama and Mississippi were slave states. Louisiana was part of the Louisiana Purchase, and was admitted (1812) as a slave state because it contained a great many slaves at the time of the purchase.