从1776年美国独立至1803年从法国购买路易斯安那并入美国，美国的扩张之路才刚刚开始。。。
录音文稿：
In1776, in Philadelphia, the Second Continental Congress declared theindependence of the colonies as the "United States". Led by GeneralGeorge Washington, it won the Revolutionary War. The peace treaty of 1783established the borders of the new nation. The Articles of Confederationestablished a central government, but it was ineffectual at providing stabilityas it could not collect taxes and had no executive officer. A convention wrotea new Constitution that was adopted in 1789 and a Bill of Rights was added in1791 to guarantee inalienable rights. With Washington as the first presidentand Alexander Hamilton his chief adviser, a strong central government wascreated. Purchase of the Louisiana Territory from France in 1803 doubled thesize of the United States.
（内容摘自英文维基百科， 美国历史词条）
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