Web• trace the expansion processes that completed the continental united states. • explain the underlying causes of the expansion of the united states. • describe the legacies of. A significant push toward the west coast of north america began in the 1810s. It was intensified by the belief in manifest destiny, federally issued indian. Webunited states westward expansion. Expansion of the united states moved steadily westward from the late 18th to the mid 19th centuries. Webhis proposal had six major points: · the admission of california as a free state. · the division of the remainder of the mexican cession into two territories, new mexico and. Weba map illustrating the patterns and routes of westward exploration and settlement in the united states after the “louisiana purchase” from france in 1803. Webin this gallery of five maps, we examine the creation and expansion of the united states from the colonization of north america by european powers to the routes. Webthe rapid western expansion of the 1840s resulted in great part from demographic, economic, and political pressures. The population of the united states. Webin 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.