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.
Prior to the war, many settlers in Ohio, the Indiana Territory, and the Illinois Territory had been threatened by Indian raids; following the war, the tribes were either restricted to ever-shrinking tribal lands or pushed further west, opening new lands for the United Statesâ westward expansion.