There are various theories that contribute to the internal and external characteristics of the US and how they have implemented their policy throughout history; realism and liberalism being the main two. ... Advocates of this theory focus on institutions, ideas, economic interdependence and the spread of democracy and liberty in the interest of the United States' security. ... Other examples include: carrying out the manifest destiny, admitting Texas into the union in 1845, the war of 1812, and the US-Mexican war; all for the aim of continental expansion and a rapid expansion of industria...

• Word Count: 1168
• Approx Pages: 5
• Grade Level: Undergraduate