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.
Andrew Jackson-Andrew Jackson was President of the United States from 1829 to 1837, and thus oversaw much of the nation's expansion. Jackson's most prominent role in westward expansion was his continuing struggle to eject the Indians East of the Mississippi from their lands to free up land for American settlers.