The document discusses the concept of Manifest Destiny and America's westward expansion between 1810-1860. Key events included the increase of nationalism, further western settlement, the Oregon dispute resolved in 1846, the Mexican War adding new territories to the US from 1846-1848, and the California Gold Rush beginning in 1849 which drew thousands of prospectors west. Overall this period saw the partial realization of Manifest Destiny and American control extending across the North American continent, though it also exacerbated tensions around the issue of slavery in the new territories.