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.
As the 19th century began, land-hungry Americans poured into the backcountry of the coastal South and began moving toward and into what would later become the states of Alabama and Mississippi. Since Indian tribes living there appeared to be the main obstacle to westward expansion, white settlers petitioned the federal government to remove them.