1、Independence of the United States（independence n.独立，自主）
1775---1783, the United States independence from Britain.
2、Expansion of American territory（territory n.领土，版图; 领地; 领域）
From independence until the end of the nineteenth Century, the territory of the United States extended from the 13 states along the coast of the Atlantic to the coast of the Pacific,also gained to the territories of Alaska and Hawaii.
3、American Civil War（war between the states）
In the year of 1861---1864, the industrial bourgeoisie in the north of the United States defeated the main class of the Slave Plantation in the south, and maintained the unity of the country, abolished slavery, and laid the foundation for the take-off of the American economy.
4、Overseas expansion forces
星耀夜阑
