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.
History >> Westward Expansion. The First Transcontinental Railroad stretched from the East Coast of the United States to the West Coast. No longer would people travel in long wagon trains that took months to reach California. They could now travel faster, safer, and cheaper by train.