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.
Expansion westward seemed perfectly natural to many Americans in the mid-nineteenth century. Like the Massachusetts Puritans who hoped to build a city upon a hill, courageous pioneers believed that America had a divine obligation to stretch the boundaries of their noble republic to the Pacific Ocean. Independence had been won in the Revolution and reaffirmed in the War of 1812.