Short introductory video of the War of 1812 by PBS America
Khan Academy dives deep into the James Monroe's presidency and his declaration of US sovereignty in the West.
John Green and Crash Course discuss wars and tactics that the US has used to expand across the North American continent
Source: http://www.imagenesde.co/us-westward-expansion-maps-us-growth/us-westward-expansion-maps-us-growth-fresh-map-us-territories-in-1803-westward-expansion-and-sectionalism-2/