Achondroplasia is one of the most common types of dwarfism. Learn about its causes, diagnosis, and treatment. Achondroplasia is one of the most common types of dwarfism.
Westward Expansion (1807-1912) The Surge West. Summary. The westward movement of the American population occurred in intermittent flurries of settlement. The first began early in the nation's history, resulting in the statehood of Vermont, Kentucky, Tennessee, and Ohio, all of which were admitted to the Union between 1791 and 1803.
It spread over a great area of the Southeast and the mid-continent, in the river valleys of what are now the states of Mississippi, Alabama, Georgia, Arkansas, Missouri, Kentucky, Illinois, Indiana, and Ohio, with scattered extensions northward into Wisconsin and Minnesota and westward into the Great Plains.