The United States believed in Manifest Destiny, which is the term used to describe how the country was destined to stretch from "sea to shining sea", or the Atlantic to Pacific. The US gained western territory by purchasing it (like the Louisiana Purchase), gaining it after war (like the Mexican Cession), or by creating an agreement with a country (like they did with Britain, thus gaining the Oregon Territory).
i do not know the 48th state and i do not know who "us" is.
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manifest destiny
War or some kind of battle
hawaii
manifest destiny
The US sought to expand its borders into Spanish territories
The Song Dynasty of China was split into two different dynasties the north and south. It did not however expand its borders. The Tang dynasty did expand its boarders.
manifest destiny
The united states sought to expand its borders into Spanish territories.
the u.s. sought to expand its borders into Spanish territories
Because Thomas Jefferson declared that it was the Manifest Destiny for the United States to have it's borders from Coast to Coast.