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.
In less than a century, westward expansion stretched the United States from a handful of states along the Eastern Seaboard all the way to the Pacific. The acquisition of Hawaii and Alaska in the mid-19th century assured westward expansion would continue into the 20th century.n less than a century, westward expansion stretched the United States from a handful of states along the Eastern Seaboard all the way to the Pacific. The acquisition of Hawaii and Alaska in the mid-19th century assured westward expansion would continue into the 20th century.