So, as the great prairies of the West became settled, the settlers became eager to join the Union. Thus new states were formed. Mississippi became a state in 1817, the first year of Monroe's presidency. Illinois followed in 1818, Alabama in 1819, and Missouri in 1821. Mississippi, Illinois and Alabama were framed out of original territory but Missouri was framed out of the Louisiana Purchase. All four names are Indian. Mississippi and Missouri are named after the rivers which flow through them, Mississippi meaning Father of Waters and Missouri Great Muddy. For the Missouri is full of yellow mud. Illinois is named after the tribe of Indians who lived there. Their name was really Iliniwok meaning "Men" but white people pronounced it badly and it became changed to Illinois. Alabama means "here we rest." In 1820 Maine also was admitted as a state. Maine, however, was not newly settled country. Since colonial days it had been a part of Massachusetts. But having become dissatisfied, it separated from Massachusetts, and asked to be admitted to the Union as a separate state. It was just about the same time that Missouri was also asking to be admitted as a state. And strangely enough the admission of these two states became connected with each other. We must look back a little to see how. You remember that two hundred years before this, slaves were first brought to Virginia. In those days no one thought that slavery was wrong. So as colony was added to colony they also became slave owners. But gradually many people began to think that slavery was a great evil, and every now and again one colony or another would try to put it down. But these attempts always ended in failure. In the northern states, however, there were few slaves. For in these northern states there was not much that slaves could do which could not be done just as well by white men. So it did not pay to keep slaves, and gradually slavery was done away with. But in the South it was different. There it was so hot that white men could not do the work in the rice and cotton fields. And the planters believed that without Negro slave labour it would be impossible to make their plantations pay. Then, when the power of steam was discovered and many new cotton spinning machines were invented, the demand for cotton became greater and greater; the Southern planters became more sure than ever that slavery was needful. They also became afraid that the people in the North would want to do away with it, and if the number of the states in which slavery was not allowed increased it would be easy for them to do this. So the Southerners determined that if non-slavery states were admitted to the Union slavery states must be admitted also to keep the balance even. Now when Maine and Missouri both asked to be admitted as states the Southerners refused to admit Maine as a free state unless Missouri was made a slave state to balance it.